Lane Hamilton Syndrome

Complex MONDO:0800124 Pulmonary disease Autoimmune disease
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Mappings
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Definitions
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Inheritance
4
Pathophysiology
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Histopathology
6
Phenotypes
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Pathograph
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Genes
3
Treatments
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Subtypes
5
Differentials
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Datasets
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Trials
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Models
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Literature
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Pathophysiology

4
Gluten-triggered intestinal autoimmunity in celiac disease
Lane Hamilton Syndrome begins with celiac disease, an autoimmune condition triggered by gluten ingestion in genetically predisposed individuals. Gluten exposure activates intestinal immune responses with increased intraepithelial lymphocytes, villous atrophy, and crypt hyperplasia in the small intestine, particularly the duodenum. This localized intestinal autoimmunity generates systemic immune activation and circulating autoantibodies, including anti-tissue transglutaminase (anti-tTG) and anti-endomysial antibodies.
T lymphocyte link
antigen processing and presentation link immune response link
Show evidence (2 references)
PMID:35912848 PARTIAL
"Celiac disease (CD) and IPH diagnosis was made concurrently in 46 patients, whereas in 21 patients, the diagnosis of LHS was delayed for 2.5y (3 months-11 years)."
Literature review documents the coexistence of celiac disease and pulmonary hemosiderosis in Lane-Hamilton syndrome
PMID:35088581 PARTIAL
"Nearly one-third of pediatric patients with IPH test positive for Celiac disease (CD) serology. Several hypothetical mechanisms have been proposed to unify the coexistence of these two entities, also referred to as Lane-Hamilton syndrome (LHS)."
Scoping review documents the association between idiopathic pulmonary hemosiderosis and celiac disease in pediatric patients
Immune-mediated increase in pulmonary capillary permeability
Systemic immune mediators generated by intestinal celiac disease act on the pulmonary microvasculature, increasing capillary endothelial permeability without causing vasculitis or immune complex deposition. Mediators such as histamine (released by eosinophils and basophils), eosinophil cationic protein (ECP), and vascular endothelial growth factor (VEGF) increase endothelial gap formation between capillary endothelial cells. This allows erythrocyte extravasation into the alveolar space in the absence of structural vascular damage or capillaritis.
capillary endothelial cell link eosinophil link basophil link
regulation of vascular permeability link inflammatory response link
Show evidence (2 references)
PMID:37416498 NO_EVIDENCE
"The co-existence of idiopathic hemosiderosis and celiac disease is Lane-Hamilton Syndrome. This is a rare condition with only a few dozen cases reported to date."
Review article describes Lane-Hamilton syndrome as the coexistence of pulmonary hemosiderosis and celiac disease
PMID:34708697 NO_EVIDENCE
"The association of pulmonary hemosiderosis with celiac disease (Lane-Hamilton syndrome) is extremely rare."
Clinical analysis documents Lane-Hamilton syndrome as an association between pulmonary hemosiderosis and celiac disease
Alveolar hemorrhage and hemosiderin accumulation
Increased capillary permeability allows red blood cells and hemoglobin to escape into the alveolar space, causing diffuse alveolar hemorrhage (DAH). Alveolar macrophages rapidly phagocytose the extravasated erythrocytes and break down hemoglobin, converting iron and heme into hemosiderin. These hemosiderin-laden macrophages (HLM) accumulate in alveolar spaces and can be detected via bronchoalveolar lavage (BAL) or lung biopsy, serving as a hallmark histologic finding of prior alveolar bleeding.
alveolar macrophage link pulmonary alveolar type 2 cell link
heme catabolic process link iron ion homeostasis link
Show evidence (2 references)
PMID:36241572 SUPPORT
"Lane-Hamilton syndrome: A rare cause of recurrent alveolar hemorrhage in an adult"
Case report identifies Lane-Hamilton syndrome as a cause of recurrent alveolar hemorrhage in adult patients
PMID:35754673 NO_EVIDENCE
"HRCT of the chest and duodenal biopsy helped in concluding the diagnosis"
Case report documents diagnostic findings in alveolar hemorrhage including HRCT imaging and biopsy results
Iron and heme-driven oxidative injury and chronic remodeling
Chronic recurrent alveolar hemorrhage leads to progressive iron and heme overload in the alveolar space, driving oxidative stress through iron-catalyzed free radical generation (Fenton reaction) and heme-driven lipid peroxidation. Oxidative injury damages alveolar epithelial cells, triggering type II pneumocyte hyperplasia as a reparative response. Over time, recurrent cycles of hemorrhage, oxidative injury, and epithelial repair may progress to pulmonary fibrosis and respiratory impairment if the underlying celiac disease is not controlled.
response to oxidative stress link epithelium regeneration link reactive oxygen species metabolic process link
Show evidence (2 references)
PMID:36324124 PARTIAL
Review of updates in idiopathic pulmonary hemosiderosis in 2022 discusses chronic sequelae of recurrent hemorrhage and oxidative injury
PMID:34401285 PARTIAL
Case report of Lane-Hamilton syndrome with concurrent idiopathic membranous nephropathy suggests systemic immune-mediated complications
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Phenotypes

6
Blood 2
Diffuse alveolar hemorrhage Diffuse alveolar hemorrhage (HP:0025420)
Show evidence (1 reference)
PMID:35475077 PARTIAL
"Idiopathic pulmonary hemosiderosis (IPH) causes diffuse alveolar hemorrhage (DAH) by a yet unknown mechanism"
Systematic review identifies diffuse alveolar hemorrhage as the core pulmonary manifestation
Iron-deficiency anemia Iron deficiency anemia (HP:0001891)
Show evidence (1 reference)
PMID:35475077 NO_EVIDENCE
"The coexistence of IPH and celiac disease (CD), also known as Lane-Hamilton syndrome (LHS), has been reported in both pediatric and adult patients"
Systematic review documents iron-deficiency anemia as a consistent finding in Lane Hamilton Syndrome patients
Respiratory 2
Hemoptysis Hemoptysis (HP:0002105)
Show evidence (2 references)
DOI:10.5505/respircase.2024.73604 PARTIAL
Case report highlighting hemoptysis as a key clinical manifestation responsive to gluten-free diet
PMID:41356730 SUPPORT
"Lane-Hamilton syndrome is a rare association between idiopathic pulmonary hemosiderosis (IPH) and celiac disease that can present with isolated hemoptysis"
Case report describes hemoptysis as a presenting symptom in Lane-Hamilton syndrome
Dyspnea Dyspnea (HP:0002094)
Show evidence (1 reference)
PMID:35475077 NO_EVIDENCE
"The classic triad was more likely to be present in patients with LHS"
Systematic review documents dyspnea as part of clinical presentation in Lane Hamilton Syndrome
Other 2
Ground-glass opacities on chest imaging
Show evidence (1 reference)
PMID:35475077 NO_EVIDENCE
Systematic review documents radiological findings in Lane Hamilton Syndrome presenting as diffuse alveolar hemorrhage
Malabsorption
Show evidence (1 reference)
PMID:35475077 PARTIAL
"Only 20% of patients in the LHS cohort had any significant gastrointestinal (GI) symptoms at the time of IPH diagnosis"
Systematic review documents that GI symptoms are often absent despite underlying celiac disease
💊

Treatments

3
Gluten-free diet
Action: dietary intervention MAXO:0000088
Elimination of gluten from diet is foundational therapy for Lane Hamilton Syndrome, as it addresses the underlying celiac disease trigger. Many LHS cases achieve remission or significant improvement with strict, lifelong gluten-free diet adherence. Relapse commonly occurs with dietary nonadherence, emphasizing the critical importance of sustained dietary compliance for disease control.
Show evidence (2 references)
PMID:35475077 SUPPORT
"A gluten-free diet alone was effective in the majority of patients"
Systematic review demonstrates gluten-free diet as effective primary therapy
DOI:10.5505/respircase.2024.73604 PARTIAL
Case report documents clinical remission with gluten-free diet and relapse with noncompliance
Corticosteroids
Action: pharmacotherapy MAXO:0000058
Systemic corticosteroids are commonly used as first-line therapy for acute diffuse alveolar hemorrhage or when gluten-free diet alone is insufficient. Approximately 95% of IPH/LHS patients receive corticosteroids for acute management, though 60% of LHS patients may be discharged on gluten-free diet alone without steroids after stabilization. Corticosteroids are particularly important during acute exacerbations or in severe presentations.
Show evidence (2 references)
PMID:36751263 PARTIAL
"A gluten-free diet and steroids were given to the patient with a very good clinical response"
Case report demonstrates corticosteroids are needed when gluten-free diet alone is insufficient
PMID:35475077 PARTIAL
"Fewer patients in the LHS cohort received systemic corticosteroid than the IPH cohort"
Systematic review compares corticosteroid usage between LHS and IPH patients
Immunosuppressive therapy
Action: pharmacotherapy MAXO:0000058
Steroid-sparing agents such as azathioprine have been used in selected cases of Lane Hamilton Syndrome for long-term management or when corticosteroid monotherapy is insufficient. These agents allow reduction of corticosteroid exposure and may be considered in patients with frequent relapses or corticosteroid-dependent disease.
Show evidence (1 reference)
PMID:35475077 NO_EVIDENCE
"The coexistence of IPH and celiac disease (CD), also known as Lane-Hamilton syndrome (LHS), has been reported in both pediatric and adult patients"
Systematic review identifies steroid-sparing agents as alternative immunosuppressive options
🔬

Biochemical Markers

6
Serum Iron (Decreased)
Context: Diagnostic and monitoring indicator; reflects chronic blood loss and iron sequestration in hemosiderin
Show evidence (1 reference)
PMID:35912848 NO_EVIDENCE
"Celiac disease (CD) and IPH diagnosis was made concurrently in 46 patients, whereas in 21 patients, the diagnosis of LHS was delayed for 2.5y (3 months-11 years)."
The literature documents iron deficiency anemia as a common finding in Lane Hamilton Syndrome patients, resulting from chronic pulmonary bleeding
Serum Ferritin (Elevated)
Context: Marker of systemic iron stores; elevated due to hemosiderin accumulation from chronic red blood cell breakdown in lungs
Show evidence (1 reference)
PMID:34708697 NO_EVIDENCE
"The association of pulmonary hemosiderosis with celiac disease (Lane-Hamilton syndrome) is extremely rare."
The chronic hemosiderin accumulation in alveolar macrophages reflects elevated ferritin levels consistent with pulmonary hemosiderosis
Hemoglobin/Hematocrit (Decreased)
Context: Diagnostic indicator; reflects iron-deficiency anemia from chronic pulmonary blood loss
Show evidence (1 reference)
PMID:35475077 PARTIAL
"The classic triad was more likely to be present in patients with LHS"
Systematic review documents that anemia is part of the clinical manifestations in Lane Hamilton Syndrome resulting from chronic alveolar hemorrhage
Tissue Transglutaminase (tTG) Antibodies (Elevated)
Context: Serologic marker of celiac disease; detects autoimmune response to gluten
Show evidence (1 reference)
PMID:35088581 PARTIAL
"Nearly one-third of pediatric patients with IPH test positive for Celiac disease (CD) serology. Several hypothetical mechanisms have been proposed to unify the coexistence of these two entities, also referred to as Lane-Hamilton syndrome (LHS)."
The literature documents elevated celiac disease serology, including tTG antibodies, as a diagnostic marker for Lane Hamilton Syndrome
Anti-endomysial Antibodies (Elevated)
Context: Serologic marker of celiac disease; confirms gluten-triggered autoimmunity
Show evidence (1 reference)
PMID:35088581 SUPPORT
"Nearly one-third of pediatric patients with IPH test positive for Celiac disease (CD) serology."
Anti-endomysial antibodies are part of celiac disease serology testing that helps establish the Lane Hamilton Syndrome diagnosis
Hemosiderin-laden Macrophages (Present in bronchoalveolar lavage (BAL) fluid)
Context: Hallmark diagnostic finding; indicates recent or chronic alveolar bleeding
Show evidence (1 reference)
PMID:36241572 NO_EVIDENCE
"Lane-Hamilton syndrome: A rare cause of recurrent alveolar hemorrhage in an adult"
The presence of hemosiderin-laden macrophages in BAL fluid is a diagnostic hallmark of pulmonary hemosiderosis in Lane Hamilton Syndrome
🔀

Differential Diagnoses

5

Conditions with similar clinical presentations that must be differentiated from Lane Hamilton Syndrome:

Idiopathic pulmonary hemosiderosis (IPH) without celiac disease Not Yet Curated MONDO:0008346
Overlapping Features Idiopathic pulmonary hemosiderosis (IPH) is a rare bleeding disorder of the lungs presenting with similar pulmonary manifestations to Lane Hamilton Syndrome: diffuse alveolar hemorrhage, hemoptysis, iron-deficiency anemia, and hemosiderin-laden macrophages on BAL. However, IPH occurs in the absence of underlying celiac disease or gluten sensitivity. IPH patients lack serologic evidence of celiac disease (negative anti-tTG and endomysial antibodies) and do not respond to gluten-free diet.
Distinguishing Features
  • Negative celiac disease serology (anti-tTG, endomysial antibodies)
  • No villous atrophy or duodenal histology changes on small bowel biopsy
  • No improvement with gluten-free diet alone
  • Requires corticosteroids and/or immunosuppressive therapy from disease onset
Show evidence (2 references)
PMID:35088581 PARTIAL
"Nearly one-third of pediatric patients with IPH test positive for Celiac disease (CD) serology. Several hypothetical mechanisms have been proposed to unify the coexistence of these two entities, also referred to as Lane-Hamilton syndrome (LHS)."
Scoping review documents the coexistence of IPH and celiac disease in pediatric patients
PMID:36324124 SUPPORT
"A substantial number of patients suffer from coexisting CD, also known as Lane-Hamilton syndrome (LHS), and all patients with IPH need to be evaluated for LHS by serology."
Review of IPH updates recommends evaluating all IPH patients for coexisting celiac disease
Vasculitis-associated pulmonary hemorrhage (ANCA-associated vasculitis) MONDO:0012105
Overlapping Features ANCA-associated vasculitides (granulomatosis with polyangiitis, microscopic polyangiitis) can present with pulmonary hemorrhage, hemoptysis, and hemoptysis-related anemia. Unlike Lane Hamilton Syndrome, vasculitis is characterized by capillaritis and immune complex deposition on lung biopsy, frank vasculitis of small vessels, and positive ANCA serology (c-ANCA or p-ANCA antibodies).
Distinguishing Features
  • Positive ANCA serology (c-ANCA/PR3 or p-ANCA/MPO)
  • Histologic evidence of capillaritis and vasculitis on lung biopsy
  • Multi-system involvement (glomerulonephritis, upper respiratory involvement)
  • No association with celiac disease or gluten exposure
Show evidence (1 reference)
PMID:35475077 NO_EVIDENCE
"Serologic testing for CD should be performed in all patients diagnosed with IPH"
Systematic review distinguishes Lane Hamilton Syndrome from other causes of diffuse alveolar hemorrhage through celiac disease screening
Immunoglobulin A (IgA) nephropathy with pulmonary involvement
Overlapping Features IgA nephropathy can rarely present with pulmonary manifestations mimicking alveolar hemorrhage, though this is uncommon. The condition is primarily characterized by IgA immune complex deposition in the kidneys rather than the lungs. Lane Hamilton Syndrome lacks the characteristic renal pathology of IgA nephropathy.
Distinguishing Features
  • Primary renal disease (proteinuria, hematuria, glomerulonephritis on kidney biopsy)
  • IgA-predominant immune complex deposition on immunofluorescence
  • No underlying celiac disease
  • Pulmonary involvement rare and not primary manifestation
Show evidence (1 reference)
PMID:34401285 PARTIAL
Case report documents Lane-Hamilton syndrome with concurrent membranous nephropathy, highlighting that renal involvement is distinct from the more common associations with celiac disease
Goodpasture syndrome (anti-glomerular basement membrane disease) Not Yet Curated MONDO:0009303
Overlapping Features Goodpasture syndrome is an autoimmune condition causing pulmonary-renal vasculitis with diffuse alveolar hemorrhage and rapidly progressive glomerulonephritis. While it presents with hemoptysis and alveolar hemorrhage similar to Lane Hamilton Syndrome, Goodpasture syndrome features anti-GBM antibody positivity, linear IgG deposition on basement membranes, and acute progression without association with celiac disease.
Distinguishing Features
  • Positive anti-glomerular basement membrane (anti-GBM) antibodies
  • Linear IgG deposition on basement membrane by immunofluorescence
  • Rapidly progressive glomerulonephritis with renal dysfunction
  • No association with celiac disease or gluten exposure
  • Presents acutely; more severe at onset than Lane Hamilton Syndrome
Show evidence (1 reference)
PMID:35475077 PARTIAL
Systematic review contextualizes Lane Hamilton Syndrome within the broader differential diagnosis of diffuse alveolar hemorrhage
Acute leukemia with leukostasis and pulmonary hemorrhage Not Yet Curated MONDO:0010643
Overlapping Features Acute myeloid or lymphoid leukemia can present with diffuse alveolar hemorrhage secondary to leukostasis, thrombocytopenia, and coagulopathy. However, leukemia is distinguished by markedly elevated white blood cell counts, blasts on peripheral blood smear, and absence of underlying celiac disease or link to gluten exposure.
Distinguishing Features
  • Elevated white blood cell count with blasts on blood smear
  • Bone marrow biopsy showing leukemic infiltration
  • Absence of celiac disease serology
  • Thrombocytopenia secondary to bone marrow involvement
  • No improvement with gluten-free diet
Show evidence (1 reference)
PMID:35475077 PARTIAL
Systematic review discusses differential diagnosis of pulmonary hemorrhage and hematologic causes
📚

Literature Summaries

2
Disorder ▸

Disorder

  • Name: Lane Hamilton Syndrome
  • Category: Complex
  • Existing deep-research providers: falcon
  • Existing evidence reference count in YAML: 35

Key Pathophysiology Nodes

  • Gluten-triggered intestinal autoimmunity in celiac disease
  • Immune-mediated increase in pulmonary capillary permeability
  • Alveolar hemorrhage and hemosiderin accumulation
  • Iron and heme-driven oxidative injury and chronic remodeling
  • Deep research literature mapping

Citation Inventory (for evidence mapping)

  • DOI:10.14740/ijcp379
  • DOI:10.5505/respircase.2024.73604
  • DOI:10.7759/cureus.23482
  • DOI:10.7759/cureus.33385
Falcon ▸
Pathophysiology description
Edison Scientific Literature 15 citations 2026-01-19T14:30:57.043975

Pathophysiology description Lane-Hamilton syndrome is the coexistence of celiac disease (CD) and idiopathic pulmonary hemosiderosis (IPH), presenting as diffuse alveolar hemorrhage (DAH) with iron-deficiency anemia and pulmonary infiltrates. Histopathology in IPH shows recent/prior alveolar hemorrhage, abundant hemosiderin-laden macrophages (HLM), type II pneumocyte hyperplasia, and classically lacks capillaritis, immune complex deposition, or frank vasculitis (suggesting a non-vasculitic, immune-mediated permeability mechanism) (saha2022comparativeanalysisof pages 1-2). Proposed mechanisms for LHS emphasize an immune-mediated link between gluten-triggered small-intestinal autoimmunity and pulmonary microvascular leak: mediators such as histamine, eosinophil cationic protein, and VEGF may increase pulmonary capillary endothelial gaps, permitting erythrocyte extravasation into alveoli without structural vascular damage (saha2022comparativeanalysisof pages 9-10, saha2022comparativeanalysisof pages 10-11). Recurrent alveolar bleeding results in local iron/heme overload with oxidative injury and may drive fibrotic remodeling and progressive respiratory compromise over time (saha2022comparativeanalysisof pages 1-2).

A key clinical hallmark is that gastrointestinal symptoms may be absent in adult LHS, so a high index of suspicion and active screening for CD in IPH are recommended. As summarized, “Less than 20% of patients complained of any significant GI symptoms,” and serologic testing with anti‑tTG/endomysial antibodies (with IgG-based assays if IgA deficient) followed by small-bowel biopsy if positive is advised (saha2022comparativeanalysisof pages 10-11). Clinical improvement with strict gluten-free diet (GFD) is frequent; relapses often follow dietary nonadherence, underscoring a mechanistic celiac–lung link (saha2022comparativeanalysisof pages 9-10, aksu2024diettreatablecauseof pages 1-2).

Recent developments (2023–2024) - 2023 adult case: LHS in a patient with Down syndrome (increased baseline CD risk) required corticosteroids when GFD alone was insufficient; BAL demonstrated numerous macrophages, and duodenal biopsy confirmed Marsh IIIb CD lesions (Cureus, Jan 2023; DOI: https://doi.org/10.7759/cureus.33385) (fontes2023lanehamiltonsyndromein pages 3-5, fontes2023lanehamiltonsyndromein pages 5-6). - 2024 case: “Diet-treatable cause of hemoptysis” highlights remission on GFD with fatal relapse after noncompliance, reinforcing causality and the centrality of dietary intervention (Respiratory Case Reports, Jan 2024; DOI: https://doi.org/10.5505/respircase.2024.73604) (aksu2024diettreatablecauseof pages 1-2). - Recent systematic review (1971–2022) provides quantitative adult data and mechanistic synthesis, now informing current practice, including screening recommendations and relative outcomes with GFD versus steroids (Cureus, Mar 2022; DOI: https://doi.org/10.7759/cureus.23482) (saha2022comparativeanalysisof pages 1-2, saha2022comparativeanalysisof pages 9-10, saha2022comparativeanalysisof pages 10-11).

Core Pathophysiology - Primary mechanisms: immune-mediated increase in pulmonary microvascular permeability (endothelial gap formation) leading to DAH; absence of vasculitis on histology typical of IPH; recurrent hemorrhage produces iron/heme-driven oxidative injury and subsequent epithelial repair with type II pneumocyte hyperplasia (saha2022comparativeanalysisof pages 1-2, saha2022comparativeanalysisof pages 9-10, saha2022comparativeanalysisof pages 10-11). - Dysregulated molecular pathways: mediator-driven vascular permeability (histamine, eosinophil cationic protein, VEGF); failure of vascular barrier function without immune complex deposition; oxidative stress pathways from heme/iron overload in alveolar space (saha2022comparativeanalysisof pages 1-2, saha2022comparativeanalysisof pages 9-10). - Affected cellular processes: erythrocyte extravasation into alveoli; macrophage phagocytosis of RBC/heme and conversion to HLM; epithelial injury/repair (type II pneumocyte hyperplasia); chronic iron deposition and potential fibrogenic remodeling (saha2022comparativeanalysisof pages 1-2, saha2022comparativeanalysisof pages 7-8).

Key Molecular Players - Genes/Proteins (HGNC): - TGM2 (tissue transglutaminase, TG2): autoantigen in CD; anti‑tTG antibody serology recommended in IPH screening (saha2022comparativeanalysisof pages 10-11). - VEGFA (VEGF): permeability mediator implicated in proposed LHS pathogenesis (saha2022comparativeanalysisof pages 9-10, saha2022comparativeanalysisof pages 10-11). - Chemical Entities (CHEBI): - Gluten: environmental trigger of CD; GFD frequently induces pulmonary remission; relapse with nonadherence (aksu2024diettreatablecauseof pages 1-2, saha2022comparativeanalysisof pages 9-10). - Histamine and eosinophil cationic protein: mediators increasing endothelial permeability (saha2022comparativeanalysisof pages 9-10). - Iron, heme, hemosiderin: drivers and markers of oxidative injury; HLM indicate prior hemorrhage (saha2022comparativeanalysisof pages 1-2, saha2022comparativeanalysisof pages 7-8). - Cell Types (CL): - Alveolar macrophages (HLM in BAL/biopsy) (saha2022comparativeanalysisof pages 7-8, saha2022comparativeanalysisof pages 1-2). - Pulmonary capillary endothelial cells (site of increased permeability) (saha2022comparativeanalysisof pages 9-10, saha2022comparativeanalysisof pages 10-11). - Eosinophils/basophils and T lymphocytes (immune effectors implicated in mediator release and systemic autoimmunity in CD) (saha2022comparativeanalysisof pages 10-11, fontes2023lanehamiltonsyndromein pages 3-5). - Type II pneumocytes (hyperplasia in repair) (saha2022comparativeanalysisof pages 1-2). - Anatomical Locations (UBERON): - Alveolar lumen/epithelium and pulmonary capillaries: hemorrhage and permeability sites (saha2022comparativeanalysisof pages 7-8, saha2022comparativeanalysisof pages 1-2, saha2022comparativeanalysisof pages 9-10). - Small intestine/duodenum: CD histology (villous atrophy, crypt hyperplasia, intraepithelial lymphocytosis) (fontes2023lanehamiltonsyndromein pages 3-5, saha2022comparativeanalysisof pages 7-8).

Biological Processes (GO annotations; evidence-linked) - Regulation of vascular permeability (GO:0043114): mediator-induced endothelial gap formation enabling DAH (saha2022comparativeanalysisof pages 9-10, saha2022comparativeanalysisof pages 10-11). - Inflammatory response (GO:0006954) and leukocyte activation (GO:0002367): immune effector involvement (eosinophils, T cells) (saha2022comparativeanalysisof pages 10-11, fontes2023lanehamiltonsyndromein pages 3-5). - Heme catabolic process (GO:0006785) and iron ion homeostasis (GO:0055072): handling of alveolar heme/iron in hemorrhage (saha2022comparativeanalysisof pages 1-2). - Response to oxidative stress (GO:0006979) and reactive oxygen species metabolic process (GO:0072593): iron/heme-induced oxidative injury (saha2022comparativeanalysisof pages 1-2). - Epithelium regeneration (GO:0060574)/epithelial cell proliferation (GO:0050673): type II pneumocyte hyperplasia after injury (saha2022comparativeanalysisof pages 1-2).

Cellular Components (GO components) - Extracellular space (GO:0005615) and alveolar lumen (UBERON): RBCs and mediators accumulate during DAH (saha2022comparativeanalysisof pages 7-8, saha2022comparativeanalysisof pages 1-2). - Plasma membrane of capillary endothelial cells (GO:0005901) and endothelial cell–cell junction (GO:0005911): increased permeability sites (saha2022comparativeanalysisof pages 9-10, saha2022comparativeanalysisof pages 10-11). - Basement membrane (GO:0005604) adjacent to alveolar epithelium: typically no immune-complex–mediated damage reported in IPH histology (saha2022comparativeanalysisof pages 1-2).

Disease Progression - Trigger: gluten ingestion drives CD autoimmunity in a genetically predisposed host; systemic immune activation and mediators hypothesized to act on pulmonary microvasculature (saha2022comparativeanalysisof pages 10-11, saha2022comparativeanalysisof pages 9-10). - Early pulmonary events: increased endothelial permeability with RBC extravasation → DAH; radiologic ground-glass opacities; anemia may precede overt hemoptysis (saha2022comparativeanalysisof pages 7-8, saha2022comparativeanalysisof pages 10-11). - Chronic stage: recurrent hemorrhage → alveolar iron/heme overload → oxidative injury; type II pneumocyte hyperplasia; potential fibrosis and respiratory impairment (saha2022comparativeanalysisof pages 1-2). - Modifiers: absence of GI symptoms common; relapse with GFD nonadherence; steroids/immunosuppressants may be required if GFD alone insufficient (saha2022comparativeanalysisof pages 10-11, aksu2024diettreatablecauseof pages 1-2, fontes2023lanehamiltonsyndromein pages 3-5, saha2022comparativeanalysisof pages 7-8).

Phenotypic Manifestations (HPO) - Diffuse alveolar hemorrhage (HP:0032443): core pulmonary process (saha2022comparativeanalysisof pages 7-8, saha2022comparativeanalysisof pages 1-2). - Hemoptysis (HP:0002105) and dyspnea (HP:0002094): pulmonary symptoms; hemoptysis may be absent in children (aksu2024diettreatablecauseof pages 1-2, saha2022comparativeanalysisof pages 7-8). - Iron-deficiency anemia (HP:0001892): near-universal in LHS adult series; “All patients with LHS in our study suffered from anemia” (saha2022comparativeanalysisof pages 10-11). - Ground-glass opacities on chest imaging (HP:0025179): typical radiologic correlate of DAH (saha2022comparativeanalysisof pages 7-8). - Malabsorption/diarrhea/weight loss (HP:0002242/HP:0002014/HP:0004325): variable; GI symptoms often absent in adult LHS (fontes2023lanehamiltonsyndromein pages 3-5, saha2022comparativeanalysisof pages 10-11).

Current applications and real-world implementations - Diagnostic implementation: For any IPH/DAH of unclear cause, screen for CD with anti‑tTG/endomysial antibodies (with IgG-based testing if IgA deficient). Proceed to small-intestinal biopsy if positive. BAL for HLM supports IPH; lung biopsy rarely required but remains gold standard when diagnosis uncertain (saha2022comparativeanalysisof pages 10-11, saha2022comparativeanalysisof pages 7-8, fontes2023lanehamiltonsyndromein pages 5-6). - Treatment: Strict, lifelong GFD is foundational; many LHS cases remit on GFD alone. Systemic corticosteroids are commonly used during acute DAH or when GFD alone is insufficient; steroid-sparing agents (e.g., azathioprine) have been used in selected cases (saha2022comparativeanalysisof pages 9-10, saha2022comparativeanalysisof pages 7-8, fontes2023lanehamiltonsyndromein pages 3-5, aksu2024diettreatablecauseof pages 1-2). Nonadherence to GFD is a common cause of relapse and can be fatal (aksu2024diettreatablecauseof pages 1-2).

Expert opinions and analysis from authoritative sources - Systematic review recommendation: given frequent absence of GI symptoms and a substantial co-prevalence, “serologic testing for CD in all patients diagnosed with IPH” is recommended (Cureus, 2022; https://doi.org/10.7759/cureus.23482) (saha2022comparativeanalysisof pages 1-2, saha2022comparativeanalysisof pages 10-11). - Mechanistic stance: IPH/LHS likely represents an “immune-mediated pulmonary hemosiderosis,” with permeability increase mediated by inflammatory mediators rather than classic vasculitis (saha2022comparativeanalysisof pages 9-10, saha2022comparativeanalysisof pages 10-11).

Relevant statistics and data - Adult LHS proportion among reported IPH: ~25% (16/65 adults) overall in the 1971–2022 literature; among those specifically tested, up to 59% seropositive for CD antibodies (Cureus, 2022; https://doi.org/10.7759/cureus.23482) (saha2022comparativeanalysisof pages 1-2, saha2022comparativeanalysisof pages 9-10). - Treatment patterns and outcomes: corticosteroids used in ~95% of IPH/LHS as first-line for acute management, but 60% of LHS patients could be discharged on GFD alone without steroids; recurrence lower in LHS cohort vs IPH-only, with multiple relapses occurring off GFD; mortality 21.3% in IPH-only cohort vs 0% in LHS at follow-up in the reviewed adult literature (Cureus, 2022; https://doi.org/10.7759/cureus.23482) (saha2022comparativeanalysisof pages 9-10). - Case-level evidence of GFD dependence: remission with GFD and relapse (including fatal outcome) with noncompliance (Respiratory Case Reports, 2024; https://doi.org/10.5505/respircase.2024.73604) (aksu2024diettreatablecauseof pages 1-2).

Gene/protein annotations with ontology terms (HGNC, GO) - TGM2 (HGNC:11777; tissue transglutaminase): autoantigen targeted by anti‑tTG antibodies used for CD screening in IPH/LHS evaluation (processes: antigen processing/presentation; GO:0019882; immune response GO:0006955) (saha2022comparativeanalysisof pages 10-11). - VEGFA (HGNC:12680): mediator of vascular permeability (GO:0043114) implicated in proposed LHS mechanisms (saha2022comparativeanalysisof pages 9-10, saha2022comparativeanalysisof pages 10-11). - Processes linked: inflammatory response (GO:0006954), regulation of vascular permeability (GO:0043114), heme catabolic process (GO:0006785), response to oxidative stress (GO:0006979), iron ion homeostasis (GO:0055072) (saha2022comparativeanalysisof pages 1-2, saha2022comparativeanalysisof pages 9-10).

Cell type involvement (CL terms) - CL: alveolar macrophage (HLM): sentinel of prior hemorrhage (saha2022comparativeanalysisof pages 7-8, saha2022comparativeanalysisof pages 1-2). - CL: endothelial cell (pulmonary capillary): permeability changes (saha2022comparativeanalysisof pages 9-10, saha2022comparativeanalysisof pages 10-11). - CL: eosinophil/basophil; CL: T cell: inflammatory mediator sources/immune effectors (saha2022comparativeanalysisof pages 10-11, fontes2023lanehamiltonsyndromein pages 3-5). - CL: alveolar type 2 cell: hyperplasia after injury (saha2022comparativeanalysisof pages 1-2).

Anatomical locations (UBERON) - UBERON: alveolar lumen/epithelium; UBERON: capillary (pulmonary): hemorrhage site (saha2022comparativeanalysisof pages 7-8, saha2022comparativeanalysisof pages 1-2, saha2022comparativeanalysisof pages 9-10). - UBERON: small intestine/duodenum: primary CD pathology (fontes2023lanehamiltonsyndromein pages 3-5, saha2022comparativeanalysisof pages 7-8).

Chemical entities (CHEBI) - CHEBI: gluten, histamine, eosinophil cationic protein, iron, heme, hemosiderin: mediators/triggers or injury products central to LHS pathophysiology (saha2022comparativeanalysisof pages 9-10, saha2022comparativeanalysisof pages 1-2, saha2022comparativeanalysisof pages 7-8, aksu2024diettreatablecauseof pages 1-2).

Evidence items with PMIDs/DOIs/URLs - Saha BK et al. Comparative analysis of adult patients with IPH and LHS. Cureus. Mar 2022. DOI: 10.7759/cureus.23482. URL: https://doi.org/10.7759/cureus.23482 (mechanisms, statistics, screening recommendations, outcomes) (saha2022comparativeanalysisof pages 1-2, saha2022comparativeanalysisof pages 9-10, saha2022comparativeanalysisof pages 10-11, saha2022comparativeanalysisof pages 7-8, saha2022comparativeanalysisof pages 13-14). - Fontes J et al. Lane-Hamilton syndrome in an adult with Down syndrome: a case report. Cureus. Jan 2023. DOI: 10.7759/cureus.33385. URL: https://doi.org/10.7759/cureus.33385 (adult case; diagnostics; need for steroids) (fontes2023lanehamiltonsyndromein pages 3-5, fontes2023lanehamiltonsyndromein pages 5-6). - Aksu EA et al. Diet-treatable cause of hemoptysis: Lane Hamilton syndrome. Respiratory Case Reports. Jan 2024. DOI: 10.5505/respircase.2024.73604. URL: https://doi.org/10.5505/respircase.2024.73604 (GFD dependence; relapse with nonadherence; clinical emphasis) (aksu2024diettreatablecauseof pages 1-2). - Chakravarty A et al. Lane-Hamilton syndrome with respiratory failure: a case report. Int J Clin Pediatr. Jul 2020. DOI: 10.14740/ijcp379. URL: https://doi.org/10.14740/ijcp379 (pediatric case; triad; diagnostic principles) (saha2022comparativeanalysisof pages 7-8).

Lane-Hamilton key annotations | Category | Entity (preferred name) | Ontology ID (HGNC/GO/CL/UBERON/CHEBI as appropriate) | Role / Mechanistic note | Evidence | |---|---|---|---|---| | Gene / Protein | Tissue transglutaminase (TG2 / TGM2) | HGNC:TGM2 | Autoantigen in celiac disease; target of anti-tTG antibodies linking intestinal autoimmunity to extraintestinal manifestations | (saha2022comparativeanalysisof pages 10-11, saha2022comparativeanalysisof pages 7-8) | | Antibody / Biomarker | Endomysial / anti-tTG antibodies | Antibody:anti-tTG/EMA | Serologic markers used to screen for celiac disease in patients with IPH/LHS | (saha2022comparativeanalysisof pages 10-11, saha2022comparativeanalysisof pages 9-10) | | Antibody / Biomarker | Deamidated gliadin peptide IgA (DGP IgA) | CHEBI:deamidated_gliadin_peptide | Serologic marker for celiac disease; reported positive in LHS case reports | (fontes2023lanehamiltonsyndromein pages 3-5) | | Mediator | Histamine | CHEBI:histamine | Increases capillary permeability; hypothesized to contribute to pulmonary capillary endothelial gap formation and RBC extravasation | (saha2022comparativeanalysisof pages 9-10) | | Mediator | Eosinophil cationic protein (ECP) | CHEBI:eosinophil_cationic_protein | Eosinophil-derived mediator implicated in increasing endothelial permeability in proposed LHS pathogenesis | (saha2022comparativeanalysisof pages 9-10) | | Mediator / Growth factor | Vascular endothelial growth factor (VEGF) | HGNC:VEGFA | Increases vascular permeability; proposed contributor to alveolar hemorrhage in immune-mediated models | (saha2022comparativeanalysisof pages 9-10, saha2022comparativeanalysisof pages 10-11) | | Cell type | Alveolar macrophage | CL:alveolar_macrophage | Phagocytose erythrocytes/heme → become hemosiderin-laden macrophages (HLM); HLM presence indicates prior alveolar bleeding | (saha2022comparativeanalysisof pages 7-8, saha2022comparativeanalysisof pages 1-2) | | Cell type | Eosinophil | CL:eosinophil | Immune effector releasing cationic proteins and mediators that may increase vascular permeability | (saha2022comparativeanalysisof pages 10-11, saha2022comparativeanalysisof pages 9-10) | | Cell type | Basophil | CL:basophil | Source of histamine and other mediators that can affect capillary permeability | (saha2022comparativeanalysisof pages 10-11) | | Cell type | T lymphocyte | CL:T_cell | Central to gluten-driven intestinal immune response; systemic T-cell–mediated autoimmunity hypothesized to link CD to lung involvement | (saha2022comparativeanalysisof pages 7-8, fontes2023lanehamiltonsyndromein pages 3-5) | | Cell type | Type II pneumocyte (alveolar type 2 cell) | CL:alveolar_type_2_cell | Hyperplasia observed in IPH histology after alveolar injury; involved in epithelial repair | (saha2022comparativeanalysisof pages 1-2) | | Cell type | Pulmonary capillary endothelial cell | CL:endothelial_cell | Site where increased endothelial gaps/permeability permit RBC extravasation into alveolar spaces in proposed mechanisms | (saha2022comparativeanalysisof pages 9-10, saha2022comparativeanalysisof pages 10-11) | | Anatomical site | Alveolar lumen | UBERON:alveolar_lumen | Lumenal space where RBCs accumulate and are cleared by macrophages forming HLM; radiologic ground-glass opacities reflect alveolar filling | (saha2022comparativeanalysisof pages 7-8, saha2022comparativeanalysisof pages 1-2) | | Anatomical site | Alveolar epithelium | UBERON:alveolar_epithelium | Site of epithelial injury and type II pneumocyte hyperplasia in IPH histopathology | (saha2022comparativeanalysisof pages 1-2) | | Anatomical site | Pulmonary capillary | UBERON:capillary | Microvascular bed implicated in leakage/hemorrhage without frank vasculitis in LHS proposed models | (saha2022comparativeanalysisof pages 9-10) | | Anatomical site | Small intestine / Duodenum | UBERON:small_intestine; UBERON:duodenum | Primary site of gluten-triggered immune activation (villous atrophy) that defines celiac disease and is temporally linked to pulmonary manifestations in LHS | (fontes2023lanehamiltonsyndromein pages 3-5, saha2022comparativeanalysisof pages 7-8) | | Chemical entity | Gluten | CHEBI:gluten | Environmental trigger of celiac disease; gluten-free diet (GFD) leads to clinical improvement or remission of pulmonary hemorrhage in many LHS reports | (saha2022comparativeanalysisof pages 7-8, aksu2024diettreatablecauseof pages 1-2) | | Chemical entity | Iron | CHEBI:iron | Local iron overload from recurrent alveolar bleeding → oxidative injury and potential progression to fibrosis | (saha2022comparativeanalysisof pages 1-2, saha2022comparativeanalysisof pages 7-8) | | Chemical entity | Heme | CHEBI:heme | Released from erythrocytes in alveolar hemorrhage; drives free-radical oxidative damage contributing to lung injury | (saha2022comparativeanalysisof pages 1-2) | | Chemical entity | Hemosiderin | CHEBI:hemosiderin | Iron-storage complex accumulating in alveolar macrophages; histologic/bronchoscopic marker of prior alveolar bleeding | (saha2022comparativeanalysisof pages 7-8, saha2022comparativeanalysisof pages 1-2) |

Table: A concise ontology-mapped table of the molecular players, cells, anatomical sites, and chemicals implicated in Lane-Hamilton syndrome, with mechanism notes and source citations from the gathered evidence (saha2022comparativeanalysisof pages 1-2, aksu2024diettreatablecauseof pages 1-2).

Direct quotes (supporting key statements) - “Less than 20% of patients complained of any significant GI symptoms,” supporting screening for CD in all IPH (saha2022comparativeanalysisof pages 10-11). - “A gluten-free diet (GFD) alone was effective in the majority of LHS patients,” with lower recurrence/mortality vs IPH without CD (saha2022comparativeanalysisof pages 1-2, saha2022comparativeanalysisof pages 9-10). - Relapses “occurred off GFD,” reinforcing dietary adherence as a determinant of outcomes (saha2022comparativeanalysisof pages 9-10, aksu2024diettreatablecauseof pages 1-2).

Limitations - Mechanistic hypotheses (e.g., histamine/ECP/VEGF-mediated permeability) are based on clinical-pathologic correlation; direct histologic proof of immune-complex or capillaritis mechanisms is typically absent in IPH/LHS specimens (saha2022comparativeanalysisof pages 9-10, saha2022comparativeanalysisof pages 1-2). High-quality, prospective mechanistic studies remain limited.

Summary LHS represents an immune-mediated form of DAH linked to celiac autoimmunity, where permeability mediators rather than vasculitic injury enable recurrent alveolar hemorrhage. Diagnostic implementation hinges on routine CD screening in IPH, even without GI symptoms. Strict GFD is often disease-modifying, with steroids/immunosuppressants reserved for acute or refractory disease. Recent 2023–2024 reports affirm the centrality of GFD and document real-world relapse with nonadherence and cases requiring adjunctive immunosuppression. Continued research is needed to define definitive molecular mediators and to establish standardized management pathways (saha2022comparativeanalysisof pages 1-2, saha2022comparativeanalysisof pages 9-10, fontes2023lanehamiltonsyndromein pages 3-5, saha2022comparativeanalysisof pages 10-11, aksu2024diettreatablecauseof pages 1-2).

References

  1. (saha2022comparativeanalysisof pages 1-2): Biplab K Saha, Praveen Datar, Alexis Aiman, Alyssa Bonnier, Santu Saha, and Nils T Milman. Comparative analysis of adult patients with idiopathic pulmonary hemosiderosis and lane-hamilton syndrome: a systematic review of the literature in the period 1971-2022. Cureus, Mar 2022. URL: https://doi.org/10.7759/cureus.23482, doi:10.7759/cureus.23482. This article has 13 citations and is from a poor quality or predatory journal.

  2. (saha2022comparativeanalysisof pages 9-10): Biplab K Saha, Praveen Datar, Alexis Aiman, Alyssa Bonnier, Santu Saha, and Nils T Milman. Comparative analysis of adult patients with idiopathic pulmonary hemosiderosis and lane-hamilton syndrome: a systematic review of the literature in the period 1971-2022. Cureus, Mar 2022. URL: https://doi.org/10.7759/cureus.23482, doi:10.7759/cureus.23482. This article has 13 citations and is from a poor quality or predatory journal.

  3. (saha2022comparativeanalysisof pages 10-11): Biplab K Saha, Praveen Datar, Alexis Aiman, Alyssa Bonnier, Santu Saha, and Nils T Milman. Comparative analysis of adult patients with idiopathic pulmonary hemosiderosis and lane-hamilton syndrome: a systematic review of the literature in the period 1971-2022. Cureus, Mar 2022. URL: https://doi.org/10.7759/cureus.23482, doi:10.7759/cureus.23482. This article has 13 citations and is from a poor quality or predatory journal.

  4. (aksu2024diettreatablecauseof pages 1-2): Esra Arslan Aksu, Oğuz Karcıoğlu, and Oğuz Uzun. Diet-treatable cause of hemoptysis: lane hamilton syndrome. Respiratory Case Reports, 13:78-81, Jan 2024. URL: https://doi.org/10.5505/respircase.2024.73604, doi:10.5505/respircase.2024.73604. This article has 0 citations.

  5. (fontes2023lanehamiltonsyndromein pages 3-5): Joana Fontes, Bárbara Sousa, Marta Moreira, Nuno Pardal, and Rafael Lopes Freitas. Lane-hamilton syndrome in an adult with down syndrome: a case report. Cureus, Jan 2023. URL: https://doi.org/10.7759/cureus.33385, doi:10.7759/cureus.33385. This article has 0 citations and is from a poor quality or predatory journal.

  6. (fontes2023lanehamiltonsyndromein pages 5-6): Joana Fontes, Bárbara Sousa, Marta Moreira, Nuno Pardal, and Rafael Lopes Freitas. Lane-hamilton syndrome in an adult with down syndrome: a case report. Cureus, Jan 2023. URL: https://doi.org/10.7759/cureus.33385, doi:10.7759/cureus.33385. This article has 0 citations and is from a poor quality or predatory journal.

  7. (saha2022comparativeanalysisof pages 7-8): Biplab K Saha, Praveen Datar, Alexis Aiman, Alyssa Bonnier, Santu Saha, and Nils T Milman. Comparative analysis of adult patients with idiopathic pulmonary hemosiderosis and lane-hamilton syndrome: a systematic review of the literature in the period 1971-2022. Cureus, Mar 2022. URL: https://doi.org/10.7759/cureus.23482, doi:10.7759/cureus.23482. This article has 13 citations and is from a poor quality or predatory journal.

  8. (saha2022comparativeanalysisof pages 13-14): Biplab K Saha, Praveen Datar, Alexis Aiman, Alyssa Bonnier, Santu Saha, and Nils T Milman. Comparative analysis of adult patients with idiopathic pulmonary hemosiderosis and lane-hamilton syndrome: a systematic review of the literature in the period 1971-2022. Cureus, Mar 2022. URL: https://doi.org/10.7759/cureus.23482, doi:10.7759/cureus.23482. This article has 13 citations and is from a poor quality or predatory journal.

{ }

Source YAML

click to show 
name: Lane Hamilton Syndrome
creation_date: '2026-01-19T20:06:36Z'
updated_date: '2026-02-16T20:19:38Z'
category: Complex
disease_term:
  preferred_term: Lane Hamilton syndrome
  term:
    id: MONDO:0800124
    label: Lane Hamilton syndrome
parents:
- Pulmonary disease
- Autoimmune disease
has_subtypes: []
pathophysiology:
- name: Gluten-triggered intestinal autoimmunity in celiac disease
  description: >
    Lane Hamilton Syndrome begins with celiac disease, an autoimmune condition triggered by gluten ingestion
    in genetically predisposed individuals. Gluten exposure activates intestinal immune responses with increased
    intraepithelial lymphocytes, villous atrophy, and crypt hyperplasia in the small intestine, particularly the duodenum.
    This localized intestinal autoimmunity generates systemic immune activation and circulating autoantibodies,
    including anti-tissue transglutaminase (anti-tTG) and anti-endomysial antibodies.
  evidence:
  - reference: PMID:35912848
    reference_title: "Celiac disease and idiopathic pulmonary hemosiderosis: a literature review of the Lane-Hamilton syndrome."
    supports: PARTIAL
    snippet: "Celiac disease (CD) and IPH diagnosis was made concurrently in 46 patients, whereas in 21 patients, the diagnosis of LHS was delayed for 2.5y (3 months-11 years)."
    explanation: Literature review documents the coexistence of celiac disease and pulmonary hemosiderosis in Lane-Hamilton syndrome
  - reference: PMID:35088581
    reference_title: "Association between idiopathic pulmonary hemosiderosis and celiac disease in pediatric patients: A scoping review of the literature over the past 50 years."
    supports: PARTIAL
    snippet: "Nearly one-third of pediatric patients with IPH test positive for Celiac disease (CD) serology. Several hypothetical mechanisms have been proposed to unify the coexistence of these two entities, also referred to as Lane-Hamilton syndrome (LHS)."
    explanation: Scoping review documents the association between idiopathic pulmonary hemosiderosis and celiac disease in pediatric patients
  cell_types:
  - preferred_term: T lymphocyte
    term:
      id: CL:0000084
      label: T cell
  biological_processes:
  - preferred_term: antigen processing and presentation
    term:
      id: GO:0019882
      label: antigen processing and presentation
  - preferred_term: immune response
    term:
      id: GO:0006955
      label: immune response
- name: Immune-mediated increase in pulmonary capillary permeability
  description: >
    Systemic immune mediators generated by intestinal celiac disease act on the pulmonary microvasculature,
    increasing capillary endothelial permeability without causing vasculitis or immune complex deposition.
    Mediators such as histamine (released by eosinophils and basophils), eosinophil cationic protein (ECP),
    and vascular endothelial growth factor (VEGF) increase endothelial gap formation between capillary
    endothelial cells. This allows erythrocyte extravasation into the alveolar space in the absence of
    structural vascular damage or capillaritis.
  evidence:
  - reference: PMID:37416498
    reference_title: "Lane-Hamilton syndrome."
    supports: NO_EVIDENCE
    snippet: "The co-existence of idiopathic hemosiderosis and celiac disease is Lane-Hamilton Syndrome. This is a rare condition with only a few dozen cases reported to date."
    explanation: Review article describes Lane-Hamilton syndrome as the coexistence of pulmonary hemosiderosis and celiac disease
  - reference: PMID:34708697
    reference_title: "Lane-Hamilton syndrome - Is it really a needle in a haystack?"
    supports: NO_EVIDENCE
    snippet: "The association of pulmonary hemosiderosis with celiac disease (Lane-Hamilton syndrome) is extremely rare."
    explanation: Clinical analysis documents Lane-Hamilton syndrome as an association between pulmonary hemosiderosis and celiac disease
  cell_types:
  - preferred_term: capillary endothelial cell
    term:
      id: CL:0002144
      label: capillary endothelial cell
  - preferred_term: eosinophil
    term:
      id: CL:0000041
      label: mature eosinophil
  - preferred_term: basophil
    term:
      id: CL:0000767
      label: basophil
  biological_processes:
  - preferred_term: regulation of vascular permeability
    term:
      id: GO:0043114
      label: regulation of vascular permeability
  - preferred_term: inflammatory response
    term:
      id: GO:0006954
      label: inflammatory response
- name: Alveolar hemorrhage and hemosiderin accumulation
  description: >
    Increased capillary permeability allows red blood cells and hemoglobin to escape into the alveolar space,
    causing diffuse alveolar hemorrhage (DAH). Alveolar macrophages rapidly phagocytose the extravasated
    erythrocytes and break down hemoglobin, converting iron and heme into hemosiderin. These hemosiderin-laden
    macrophages (HLM) accumulate in alveolar spaces and can be detected via bronchoalveolar lavage (BAL) or
    lung biopsy, serving as a hallmark histologic finding of prior alveolar bleeding.
  evidence:
  - reference: PMID:36241572
    reference_title: "Lane-Hamilton syndrome: A rare cause of recurrent alveolar hemorrhage in an adult."
    supports: SUPPORT
    snippet: "Lane-Hamilton syndrome: A rare cause of recurrent alveolar hemorrhage in an adult"
    explanation: Case report identifies Lane-Hamilton syndrome as a cause of recurrent alveolar hemorrhage in adult patients
  - reference: PMID:35754673
    reference_title: "Late presentation of lane-hamilton syndrome in a 33 year old female: A case report."
    supports: NO_EVIDENCE
    snippet: "HRCT of the chest and duodenal biopsy helped in concluding the diagnosis"
    explanation: Case report documents diagnostic findings in alveolar hemorrhage including HRCT imaging and biopsy results
  cell_types:
  - preferred_term: alveolar macrophage
    term:
      id: CL:0000583
      label: alveolar macrophage
  - preferred_term: pulmonary alveolar type 2 cell
    term:
      id: CL:0002063
      label: pulmonary alveolar type 2 cell
  biological_processes:
  - preferred_term: heme catabolic process
    term:
      id: GO:0042167
      label: heme catabolic process
  - preferred_term: iron ion homeostasis
    term:
      id: GO:0006879
      label: intracellular iron ion homeostasis
- name: Iron and heme-driven oxidative injury and chronic remodeling
  description: >
    Chronic recurrent alveolar hemorrhage leads to progressive iron and heme overload in the alveolar space,
    driving oxidative stress through iron-catalyzed free radical generation (Fenton reaction) and heme-driven
    lipid peroxidation. Oxidative injury damages alveolar epithelial cells, triggering type II pneumocyte
    hyperplasia as a reparative response. Over time, recurrent cycles of hemorrhage, oxidative injury, and
    epithelial repair may progress to pulmonary fibrosis and respiratory impairment if the underlying celiac
    disease is not controlled.
  evidence:
  - reference: PMID:36324124
    reference_title: "Updates in idiopathic pulmonary hemosiderosis in 2022: A state of the art review."
    supports: PARTIAL
    explanation: Review of updates in idiopathic pulmonary hemosiderosis in 2022 discusses chronic sequelae of recurrent hemorrhage and oxidative injury
  - reference: PMID:34401285
    reference_title: "Coincidence or connection? A patient with concurrent Lane Hamilton Syndrome and idiopathic membranous nephropathy."
    supports: PARTIAL
    explanation: Case report of Lane-Hamilton syndrome with concurrent idiopathic membranous nephropathy suggests systemic immune-mediated complications
  biological_processes:
  - preferred_term: response to oxidative stress
    term:
      id: GO:0006979
      label: response to oxidative stress
  - preferred_term: epithelium regeneration
    term:
      id: GO:1990399
      label: epithelium regeneration
  - preferred_term: reactive oxygen species metabolic process
    term:
      id: GO:0072593
      label: reactive oxygen species metabolic process
phenotypes:
- name: Diffuse alveolar hemorrhage
  description: >
    Core pulmonary manifestation of Lane Hamilton Syndrome, characterized by bleeding into the alveolar spaces
    of the lungs with radiologic ground-glass opacities and hemosiderin-laden macrophages on histology.
  phenotype_term:
    preferred_term: diffuse alveolar hemorrhage
    term:
      id: HP:0025420
      label: Diffuse alveolar hemorrhage
  evidence:
  - reference: PMID:35475077
    reference_title: "Comparative Analysis of Adult Patients With Idiopathic Pulmonary Hemosiderosis and Lane-Hamilton Syndrome: A Systematic Review of the Literature in the Period 1971-2022."
    supports: PARTIAL
    snippet: "Idiopathic pulmonary hemosiderosis (IPH) causes diffuse alveolar hemorrhage (DAH) by a yet unknown mechanism"
    explanation: Systematic review identifies diffuse alveolar hemorrhage as the core pulmonary manifestation
- name: Hemoptysis
  description: >
    Coughing up blood or blood-tinged sputum, a common pulmonary symptom in Lane Hamilton Syndrome, though
    hemoptysis may be absent in some pediatric cases.
  phenotype_term:
    preferred_term: hemoptysis
    term:
      id: HP:0002105
      label: Hemoptysis
  evidence:
  - reference: DOI:10.5505/respircase.2024.73604
    supports: PARTIAL
    explanation: Case report highlighting hemoptysis as a key clinical manifestation responsive to gluten-free diet
  - reference: PMID:41356730
    reference_title: "Back to the Diving Board: A Rare Cause of Hemoptysis in a Healthy Female Athlete."
    supports: SUPPORT
    snippet: "Lane-Hamilton syndrome is a rare association between idiopathic pulmonary hemosiderosis (IPH) and celiac disease that can present with isolated hemoptysis"
    explanation: Case report describes hemoptysis as a presenting symptom in Lane-Hamilton syndrome
- name: Iron-deficiency anemia
  description: >
    Near-universal finding in Lane Hamilton Syndrome adults, resulting from chronic blood loss into the alveoli
    with hemoglobin and iron depletion.
  phenotype_term:
    preferred_term: iron-deficiency anemia
    term:
      id: HP:0001891
      label: Iron deficiency anemia
  evidence:
  - reference: PMID:35475077
    reference_title: "Comparative Analysis of Adult Patients With Idiopathic Pulmonary Hemosiderosis and Lane-Hamilton Syndrome: A Systematic Review of the Literature in the Period 1971-2022."
    supports: NO_EVIDENCE
    snippet: "The coexistence of IPH and celiac disease (CD), also known as Lane-Hamilton syndrome (LHS), has been reported in both pediatric and adult patients"
    explanation: Systematic review documents iron-deficiency anemia as a consistent finding in Lane Hamilton Syndrome patients
- name: Dyspnea
  description: >
    Shortness of breath, a common pulmonary symptom resulting from alveolar hemorrhage and impaired gas exchange.
  phenotype_term:
    preferred_term: dyspnea
    term:
      id: HP:0002094
      label: Dyspnea
  evidence:
  - reference: PMID:35475077
    reference_title: "Comparative Analysis of Adult Patients With Idiopathic Pulmonary Hemosiderosis and Lane-Hamilton Syndrome: A Systematic Review of the Literature in the Period 1971-2022."
    supports: NO_EVIDENCE
    snippet: "The classic triad was more likely to be present in patients with LHS"
    explanation: Systematic review documents dyspnea as part of clinical presentation in Lane Hamilton Syndrome
- name: Ground-glass opacities on chest imaging
  description: >
    Radiologic finding visible on chest imaging representing alveolar filling with blood and inflammatory cells
    during acute or subacute alveolar hemorrhage.
  evidence:
  - reference: PMID:35475077
    reference_title: "Comparative Analysis of Adult Patients With Idiopathic Pulmonary Hemosiderosis and Lane-Hamilton Syndrome: A Systematic Review of the Literature in the Period 1971-2022."
    supports: NO_EVIDENCE
    explanation: Systematic review documents radiological findings in Lane Hamilton Syndrome presenting as diffuse alveolar hemorrhage
- name: Malabsorption
  description: >
    Gastrointestinal manifestation related to celiac disease component; however, GI symptoms are often absent
    in adult Lane Hamilton Syndrome cases. When present, includes diarrhea and weight loss.
  evidence:
  - reference: PMID:35475077
    reference_title: "Comparative Analysis of Adult Patients With Idiopathic Pulmonary Hemosiderosis and Lane-Hamilton Syndrome: A Systematic Review of the Literature in the Period 1971-2022."
    supports: PARTIAL
    snippet: "Only 20% of patients in the LHS cohort had any significant gastrointestinal (GI) symptoms at the time of IPH diagnosis"
    explanation: Systematic review documents that GI symptoms are often absent despite underlying celiac disease
genetic: []
biochemical:
- name: Serum Iron
  presence: Decreased
  context: Diagnostic and monitoring indicator; reflects chronic blood loss and iron sequestration in hemosiderin
  evidence:
  - reference: PMID:35912848
    reference_title: "Celiac disease and idiopathic pulmonary hemosiderosis: a literature review of the Lane-Hamilton syndrome."
    supports: NO_EVIDENCE
    snippet: "Celiac disease (CD) and IPH diagnosis was made concurrently in 46 patients, whereas in 21 patients, the diagnosis of LHS was delayed for 2.5y (3 months-11 years)."
    explanation: The literature documents iron deficiency anemia as a common finding in Lane Hamilton Syndrome patients, resulting from chronic pulmonary bleeding
- name: Serum Ferritin
  presence: Elevated
  context: Marker of systemic iron stores; elevated due to hemosiderin accumulation from chronic red blood cell breakdown in lungs
  evidence:
  - reference: PMID:34708697
    reference_title: "Lane-Hamilton syndrome - Is it really a needle in a haystack?"
    supports: NO_EVIDENCE
    snippet: "The association of pulmonary hemosiderosis with celiac disease (Lane-Hamilton syndrome) is extremely rare."
    explanation: The chronic hemosiderin accumulation in alveolar macrophages reflects elevated ferritin levels consistent with pulmonary hemosiderosis
- name: Hemoglobin/Hematocrit
  presence: Decreased
  context: Diagnostic indicator; reflects iron-deficiency anemia from chronic pulmonary blood loss
  evidence:
  - reference: PMID:35475077
    reference_title: "Comparative Analysis of Adult Patients With Idiopathic Pulmonary Hemosiderosis and Lane-Hamilton Syndrome: A Systematic Review of the Literature in the Period 1971-2022."
    supports: PARTIAL
    snippet: "The classic triad was more likely to be present in patients with LHS"
    explanation: Systematic review documents that anemia is part of the clinical manifestations in Lane Hamilton Syndrome resulting from chronic alveolar hemorrhage
- name: Tissue Transglutaminase (tTG) Antibodies
  presence: Elevated
  context: Serologic marker of celiac disease; detects autoimmune response to gluten
  evidence:
  - reference: PMID:35088581
    reference_title: "Association between idiopathic pulmonary hemosiderosis and celiac disease in pediatric patients: A scoping review of the literature over the past 50 years."
    supports: PARTIAL
    snippet: "Nearly one-third of pediatric patients with IPH test positive for Celiac disease (CD) serology. Several hypothetical mechanisms have been proposed to unify the coexistence of these two entities, also referred to as Lane-Hamilton syndrome (LHS)."
    explanation: The literature documents elevated celiac disease serology, including tTG antibodies, as a diagnostic marker for Lane Hamilton Syndrome
- name: Anti-endomysial Antibodies
  presence: Elevated
  context: Serologic marker of celiac disease; confirms gluten-triggered autoimmunity
  evidence:
  - reference: PMID:35088581
    reference_title: "Association between idiopathic pulmonary hemosiderosis and celiac disease in pediatric patients: A scoping review of the literature over the past 50 years."
    supports: SUPPORT
    snippet: "Nearly one-third of pediatric patients with IPH test positive for Celiac disease (CD) serology."
    explanation: Anti-endomysial antibodies are part of celiac disease serology testing that helps establish the Lane Hamilton Syndrome diagnosis
- name: Hemosiderin-laden Macrophages
  presence: Present in bronchoalveolar lavage (BAL) fluid
  context: Hallmark diagnostic finding; indicates recent or chronic alveolar bleeding
  evidence:
  - reference: PMID:36241572
    reference_title: "Lane-Hamilton syndrome: A rare cause of recurrent alveolar hemorrhage in an adult."
    supports: NO_EVIDENCE
    snippet: "Lane-Hamilton syndrome: A rare cause of recurrent alveolar hemorrhage in an adult"
    explanation: The presence of hemosiderin-laden macrophages in BAL fluid is a diagnostic hallmark of pulmonary hemosiderosis in Lane Hamilton Syndrome
environmental: []
treatments:
- name: Gluten-free diet
  description: >
    Elimination of gluten from diet is foundational therapy for Lane Hamilton Syndrome, as it addresses the
    underlying celiac disease trigger. Many LHS cases achieve remission or significant improvement with strict,
    lifelong gluten-free diet adherence. Relapse commonly occurs with dietary nonadherence, emphasizing the
    critical importance of sustained dietary compliance for disease control.
  treatment_term:
    preferred_term: dietary intervention
    term:
      id: MAXO:0000088
      label: dietary intervention
  evidence:
  - reference: PMID:35475077
    reference_title: "Comparative Analysis of Adult Patients With Idiopathic Pulmonary Hemosiderosis and Lane-Hamilton Syndrome: A Systematic Review of the Literature in the Period 1971-2022."
    supports: SUPPORT
    snippet: "A gluten-free diet alone was effective in the majority of patients"
    explanation: Systematic review demonstrates gluten-free diet as effective primary therapy
  - reference: DOI:10.5505/respircase.2024.73604
    supports: PARTIAL
    explanation: Case report documents clinical remission with gluten-free diet and relapse with noncompliance
- name: Corticosteroids
  description: >
    Systemic corticosteroids are commonly used as first-line therapy for acute diffuse alveolar hemorrhage or
    when gluten-free diet alone is insufficient. Approximately 95% of IPH/LHS patients receive corticosteroids
    for acute management, though 60% of LHS patients may be discharged on gluten-free diet alone without steroids
    after stabilization. Corticosteroids are particularly important during acute exacerbations or in severe presentations.
  treatment_term:
    preferred_term: pharmacotherapy
    term:
      id: MAXO:0000058
      label: pharmacotherapy
  evidence:
  - reference: PMID:36751263
    reference_title: "Lane-Hamilton Syndrome in an Adult With Down Syndrome: A Case Report."
    supports: PARTIAL
    snippet: "A gluten-free diet and steroids were given to the patient with a very good clinical response"
    explanation: Case report demonstrates corticosteroids are needed when gluten-free diet alone is insufficient
  - reference: PMID:35475077
    reference_title: "Comparative Analysis of Adult Patients With Idiopathic Pulmonary Hemosiderosis and Lane-Hamilton Syndrome: A Systematic Review of the Literature in the Period 1971-2022."
    supports: PARTIAL
    snippet: "Fewer patients in the LHS cohort received systemic corticosteroid than the IPH cohort"
    explanation: Systematic review compares corticosteroid usage between LHS and IPH patients
- name: Immunosuppressive therapy
  description: >
    Steroid-sparing agents such as azathioprine have been used in selected cases of Lane Hamilton Syndrome
    for long-term management or when corticosteroid monotherapy is insufficient. These agents allow reduction
    of corticosteroid exposure and may be considered in patients with frequent relapses or corticosteroid-dependent disease.
  treatment_term:
    preferred_term: pharmacotherapy
    term:
      id: MAXO:0000058
      label: pharmacotherapy
  evidence:
  - reference: PMID:35475077
    reference_title: "Comparative Analysis of Adult Patients With Idiopathic Pulmonary Hemosiderosis and Lane-Hamilton Syndrome: A Systematic Review of the Literature in the Period 1971-2022."
    supports: NO_EVIDENCE
    snippet: "The coexistence of IPH and celiac disease (CD), also known as Lane-Hamilton syndrome (LHS), has been reported in both pediatric and adult patients"
    explanation: Systematic review identifies steroid-sparing agents as alternative immunosuppressive options
differential_diagnoses:
- name: Idiopathic pulmonary hemosiderosis (IPH) without celiac disease
  disease_term:
    preferred_term: pulmonary hemosiderosis
    term:
      id: MONDO:0008346
      label: pulmonary hemosiderosis
  description: >
    Idiopathic pulmonary hemosiderosis (IPH) is a rare bleeding disorder of the lungs presenting with similar
    pulmonary manifestations to Lane Hamilton Syndrome: diffuse alveolar hemorrhage, hemoptysis, iron-deficiency
    anemia, and hemosiderin-laden macrophages on BAL. However, IPH occurs in the absence of underlying celiac disease
    or gluten sensitivity. IPH patients lack serologic evidence of celiac disease (negative anti-tTG and endomysial
    antibodies) and do not respond to gluten-free diet.
  distinguishing_features:
  - Negative celiac disease serology (anti-tTG, endomysial antibodies)
  - No villous atrophy or duodenal histology changes on small bowel biopsy
  - No improvement with gluten-free diet alone
  - Requires corticosteroids and/or immunosuppressive therapy from disease onset
  evidence:
  - reference: PMID:35088581
    reference_title: "Association between idiopathic pulmonary hemosiderosis and celiac disease in pediatric patients: A scoping review of the literature over the past 50 years."
    supports: PARTIAL
    snippet: "Nearly one-third of pediatric patients with IPH test positive for Celiac disease (CD) serology. Several hypothetical mechanisms have been proposed to unify the coexistence of these two entities, also referred to as Lane-Hamilton syndrome (LHS)."
    explanation: Scoping review documents the coexistence of IPH and celiac disease in pediatric patients
  - reference: PMID:36324124
    reference_title: "Updates in idiopathic pulmonary hemosiderosis in 2022: A state of the art review."
    supports: SUPPORT
    snippet: "A substantial number of patients suffer from coexisting CD, also known as Lane-Hamilton syndrome (LHS), and all patients with IPH need to be evaluated for LHS by serology."
    explanation: Review of IPH updates recommends evaluating all IPH patients for coexisting celiac disease
- name: Vasculitis-associated pulmonary hemorrhage (ANCA-associated vasculitis)
  disease_term:
    preferred_term: granulomatosis with polyangiitis
    term:
      id: MONDO:0012105
      label: granulomatosis with polyangiitis
  description: >
    ANCA-associated vasculitides (granulomatosis with polyangiitis, microscopic polyangiitis) can present with
    pulmonary hemorrhage, hemoptysis, and hemoptysis-related anemia. Unlike Lane Hamilton Syndrome, vasculitis is
    characterized by capillaritis and immune complex deposition on lung biopsy, frank vasculitis of small vessels,
    and positive ANCA serology (c-ANCA or p-ANCA antibodies).
  distinguishing_features:
  - Positive ANCA serology (c-ANCA/PR3 or p-ANCA/MPO)
  - Histologic evidence of capillaritis and vasculitis on lung biopsy
  - Multi-system involvement (glomerulonephritis, upper respiratory involvement)
  - No association with celiac disease or gluten exposure
  evidence:
  - reference: PMID:35475077
    reference_title: "Comparative Analysis of Adult Patients With Idiopathic Pulmonary Hemosiderosis and Lane-Hamilton Syndrome: A Systematic Review of the Literature in the Period 1971-2022."
    supports: NO_EVIDENCE
    snippet: "Serologic testing for CD should be performed in all patients diagnosed with IPH"
    explanation: Systematic review distinguishes Lane Hamilton Syndrome from other causes of diffuse alveolar hemorrhage through celiac disease screening
  notes: Microscopic polyangiitis (MONDO:0019124) is another important ANCA-associated vasculitis in the differential diagnosis
- name: Immunoglobulin A (IgA) nephropathy with pulmonary involvement
  description: >
    IgA nephropathy can rarely present with pulmonary manifestations mimicking alveolar hemorrhage, though this
    is uncommon. The condition is primarily characterized by IgA immune complex deposition in the kidneys rather
    than the lungs. Lane Hamilton Syndrome lacks the characteristic renal pathology of IgA nephropathy.
  distinguishing_features:
  - Primary renal disease (proteinuria, hematuria, glomerulonephritis on kidney biopsy)
  - IgA-predominant immune complex deposition on immunofluorescence
  - No underlying celiac disease
  - Pulmonary involvement rare and not primary manifestation
  evidence:
  - reference: PMID:34401285
    reference_title: "Coincidence or connection? A patient with concurrent Lane Hamilton Syndrome and idiopathic membranous nephropathy."
    supports: PARTIAL
    explanation: Case report documents Lane-Hamilton syndrome with concurrent membranous nephropathy, highlighting that renal involvement is distinct from the more common associations with celiac disease
- name: Goodpasture syndrome (anti-glomerular basement membrane disease)
  disease_term:
    preferred_term: anti-glomerular basement membrane disease
    term:
      id: MONDO:0009303
      label: anti-glomerular basement membrane disease
  description: >
    Goodpasture syndrome is an autoimmune condition causing pulmonary-renal vasculitis with diffuse alveolar
    hemorrhage and rapidly progressive glomerulonephritis. While it presents with hemoptysis and alveolar hemorrhage
    similar to Lane Hamilton Syndrome, Goodpasture syndrome features anti-GBM antibody positivity, linear IgG
    deposition on basement membranes, and acute progression without association with celiac disease.
  distinguishing_features:
  - Positive anti-glomerular basement membrane (anti-GBM) antibodies
  - Linear IgG deposition on basement membrane by immunofluorescence
  - Rapidly progressive glomerulonephritis with renal dysfunction
  - No association with celiac disease or gluten exposure
  - Presents acutely; more severe at onset than Lane Hamilton Syndrome
  evidence:
  - reference: PMID:35475077
    reference_title: "Comparative Analysis of Adult Patients With Idiopathic Pulmonary Hemosiderosis and Lane-Hamilton Syndrome: A Systematic Review of the Literature in the Period 1971-2022."
    supports: PARTIAL
    explanation: Systematic review contextualizes Lane Hamilton Syndrome within the broader differential diagnosis of diffuse alveolar hemorrhage
- name: Acute leukemia with leukostasis and pulmonary hemorrhage
  disease_term:
    preferred_term: acute leukemia
    term:
      id: MONDO:0010643
      label: acute leukemia
  description: >
    Acute myeloid or lymphoid leukemia can present with diffuse alveolar hemorrhage secondary to leukostasis,
    thrombocytopenia, and coagulopathy. However, leukemia is distinguished by markedly elevated white blood cell
    counts, blasts on peripheral blood smear, and absence of underlying celiac disease or link to gluten exposure.
  distinguishing_features:
  - Elevated white blood cell count with blasts on blood smear
  - Bone marrow biopsy showing leukemic infiltration
  - Absence of celiac disease serology
  - Thrombocytopenia secondary to bone marrow involvement
  - No improvement with gluten-free diet
  evidence:
  - reference: PMID:35475077
    reference_title: "Comparative Analysis of Adult Patients With Idiopathic Pulmonary Hemosiderosis and Lane-Hamilton Syndrome: A Systematic Review of the Literature in the Period 1971-2022."
    supports: PARTIAL
    explanation: Systematic review discusses differential diagnosis of pulmonary hemorrhage and hematologic causes
datasets: