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Lane Hamilton Syndrome

Complex MONDO:0800124 Pulmonary disease Autoimmune disease
0
Mappings
0
Definitions
0
Inheritance
4
Pathophysiology
0
Histopathology
6
Phenotypes
0
Genes
3
Treatments
0
Subtypes
5
Differentials
0
Datasets
0
Trials
⚙

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
●

Phenotypes

6
Blood(2) Respiratory(2) Other(2)
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 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 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 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
{ }

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
    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
    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
    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
    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
    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
    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:0006785
      label: heme catabolic process
  - preferred_term: iron ion homeostasis
    term:
      id: GO:0055072
      label: 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
    supports: PARTIAL
    explanation: Review of updates in idiopathic pulmonary hemosiderosis in 2022 discusses chronic sequelae of recurrent hemorrhage and oxidative injury
  - reference: PMID:34401285
    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:0060574
      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
    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
    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
    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
    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
    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
    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
    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
    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
    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
    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
    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
    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
    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
    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
    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
    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
    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
    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
    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
    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
    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
    supports: PARTIAL
    explanation: Systematic review discusses differential diagnosis of pulmonary hemorrhage and hematologic causes
datasets: