Dermoid cyst (mature cystic teratoma) is a benign developmental lesion composed of mature, well-differentiated tissue derived from one or more embryonic germ layers, with ectodermal derivatives (keratinizing squamous epithelium, hair follicles, sebaceous glands, and teeth) predominating. The prototypical form is the ovarian mature cystic teratoma, which arises by parthenogenetic development of a germ cell. Dermoid cysts also occur at extragonadal sites, including the central nervous system (intracranial, spinal), the craniofacial midline (nasal dermoid sinus cyst, orbital/periorbital dermoid), the ocular surface (limbal/epibulbar dermoid), and the skin and subcutaneous tissue, where they reflect entrapment of ectoderm during embryonic midline fusion. Most lesions are sporadic; a rare hereditary ovarian form has been linked to a germline BMP15 mutation.
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name: Dermoid Cyst
creation_date: "2026-06-30T00:00:00Z"
category: Complex
disease_term:
preferred_term: dermoid cyst
term:
id: MONDO:0002378
label: dermoid cyst
parents:
- Cystic Teratoma
synonyms:
- mature cystic teratoma
- benign cystic teratoma
- dermoid
- dermoid tumor
description: >
Dermoid cyst (mature cystic teratoma) is a benign developmental lesion
composed of mature, well-differentiated tissue derived from one or more
embryonic germ layers, with ectodermal derivatives (keratinizing squamous
epithelium, hair follicles, sebaceous glands, and teeth) predominating. The
prototypical form is the ovarian mature cystic teratoma, which arises by
parthenogenetic development of a germ cell. Dermoid cysts also occur at
extragonadal sites, including the central nervous system (intracranial,
spinal), the craniofacial midline (nasal dermoid sinus cyst, orbital/periorbital
dermoid), the ocular surface (limbal/epibulbar dermoid), and the skin and
subcutaneous tissue, where they reflect entrapment of ectoderm during
embryonic midline fusion. Most lesions are sporadic; a rare hereditary ovarian
form has been linked to a germline BMP15 mutation.
pathophysiology:
- name: Germ Cell Parthenogenetic Origin
description: >
Ovarian mature cystic teratoma originates from a single ovarian germ
cell/oocyte that develops parthenogenetically (without fertilization). The
tumor typically arises after completion of meiosis I with failure of meiosis
II, producing a near-diploid genome that contains only maternal genetic
material. This parthenogenetic origin explains the largely cytogenetically
bland karyotype and the characteristic imprinting abnormalities of these
tumors, distinguishing them from malignant germ cell tumors driven by
isochromosome 12p and somatic mutation.
cell_types:
- preferred_term: oocyte
term:
id: CL:0000023
label: oocyte
- preferred_term: granulosa cell
term:
id: CL:0000501
label: granulosa cell
biological_processes:
- preferred_term: egg activation (parthenogenetic oocyte activation)
term:
id: GO:0007343
label: egg activation
modifier: INCREASED
- preferred_term: meiotic cell cycle
term:
id: GO:0051321
label: meiotic cell cycle
evidence:
- reference: PMID:37174909
reference_title: "Immature Teratoma: Diagnosis and Management-A Review of the Literature."
supports: SUPPORT
evidence_source: HUMAN_CLINICAL
snippet: "An immature teratoma is a germinal malignant tumor composed of three germ cell layers, occurring more frequently in young women."
explanation: >
Establishes that ovarian teratomas (the malignant immature counterpart of
the benign mature dermoid cyst) are germ-cell-derived tumors composed of
all three germ layers, supporting the germ-cell origin of the entity.
- reference: PMID:37372675
reference_title: "Clinical Challenges in the Management of Malignant Ovarian Germ Cell Tumours."
supports: SUPPORT
evidence_source: HUMAN_CLINICAL
snippet: "Precursory germ cells of the ovary form the basis of GCT."
explanation: >
Supports the germ-cell origin of ovarian germ cell tumors, the class that
includes mature teratoma (dermoid cyst).
- reference: PMID:37372675
reference_title: "Clinical Challenges in the Management of Malignant Ovarian Germ Cell Tumours."
supports: SUPPORT
evidence_source: HUMAN_CLINICAL
snippet: "They are histologically classified into primitive GCT, teratomas, and monodermal and somatic-type tumours associated with dermoid cysts."
explanation: >
Confirms that teratomas/dermoid cysts are a recognized histological class
of ovarian germ cell tumor.
downstream:
- target: Mature Tri-Lineage Tissue Differentiation
description: >
Parthenogenetic activation of the germ cell drives differentiation into
mature somatic tissue of multiple germ layers within the cyst.
causal_link_type: DIRECT
- name: BMP15 / H-Ras-MAPK Dysregulation in Hereditary Ovarian Teratoma
description: >
In a rare hereditary, X-linked dominant ovarian (immature) teratoma, a
germline BMP15 missense mutation (C262T; p.Arg88Cys) reduces secretion of
mature BMP15 by ~85%. Loss of BMP15 oocyte growth-factor signaling is
associated with abnormal activation of the H-Ras/MAPK pathway in oocytes,
which markedly increases the rate of spontaneous parthenogenetic activation
and predisposes to teratoma formation. This defines a molecular,
germline-mediated route to the parthenogenetic origin seen in sporadic
tumors.
genes:
- preferred_term: BMP15
term:
id: hgnc:1068
label: BMP15
biological_processes:
- preferred_term: MAPK cascade activation
term:
id: GO:0043410
label: positive regulation of MAPK cascade
modifier: INCREASED
evidence:
- reference: PMID:38427603
reference_title: "A rare germline BMP15 missense mutation causes hereditary ovarian immature teratoma in human."
supports: SUPPORT
evidence_source: HUMAN_CLINICAL
snippet: "A rare missense germline mutation (C262T) in the first exon of the BMP15 gene was identified."
explanation: >
Identifies the causal germline BMP15 C262T variant in pedigrees with
hereditary ovarian immature teratoma.
- reference: PMID:38427603
reference_title: "A rare germline BMP15 missense mutation causes hereditary ovarian immature teratoma in human."
supports: SUPPORT
evidence_source: IN_VITRO
snippet: "In vitro experiments on cell lines confirmed that the mutation caused an 84.7% reduction in the secretion of mature BMP15."
explanation: >
Quantifies the functional consequence of the variant: a ~85% reduction in
secretion of mature BMP15.
- reference: PMID:38427603
reference_title: "A rare germline BMP15 missense mutation causes hereditary ovarian immature teratoma in human."
supports: SUPPORT
evidence_source: MODEL_ORGANISM
snippet: "In the transgenic mouse model, the spontaneous parthenogenetic activation significantly increased in oocytes carrying the T allele."
explanation: >
Mouse model evidence linking the BMP15 variant to increased spontaneous
parthenogenetic activation of oocytes.
- reference: PMID:38427603
reference_title: "A rare germline BMP15 missense mutation causes hereditary ovarian immature teratoma in human."
supports: SUPPORT
evidence_source: MODEL_ORGANISM
snippet: "Oocyte-specific RNA sequencing revealed that abnormal activation of the H-Ras/MAPK pathway might contribute to the development of OIT."
explanation: >
Implicates H-Ras/MAPK pathway activation downstream of BMP15 loss in
teratoma development.
downstream:
- target: Germ Cell Parthenogenetic Origin
description: >
BMP15 loss and H-Ras/MAPK activation increase spontaneous parthenogenetic
oocyte activation, the initiating event in ovarian teratoma formation.
causal_link_type: INDIRECT_KNOWN_INTERMEDIATES
evidence:
- reference: PMID:38427603
reference_title: "A rare germline BMP15 missense mutation causes hereditary ovarian immature teratoma in human."
supports: SUPPORT
evidence_source: MODEL_ORGANISM
snippet: "Remarkably, a mouse carrying the T allele developed the phenotype of OIT."
explanation: >
Demonstrates that the BMP15 variant is sufficient to drive teratoma
formation via increased parthenogenetic activation.
- name: Mature Tri-Lineage Tissue Differentiation
description: >
Within the cyst, the activated germ cell differentiates into mature,
well-differentiated somatic tissues, with ectodermal derivatives
predominating: a wall lined by keratinizing squamous epithelium with
numerous adnexal structures (hair follicles, sebaceous glands, occasional
apocrine glands and teeth), surrounded by a dense, concentrically arranged
collagen stroma. The cyst lumen accumulates lamellar keratin, hair, and
sebaceous material. At craniofacial and cutaneous sites the equivalent
histology arises instead from ectoderm entrapped during midline fusion.
cell_types:
- preferred_term: keratinizing squamous epithelial cell
term:
id: CL:0000312
label: keratinocyte
- preferred_term: sebaceous gland cell
term:
id: CL:2000021
label: sebaceous gland cell
biological_processes:
- preferred_term: keratinocyte differentiation
term:
id: GO:0030216
label: keratinocyte differentiation
- preferred_term: hair follicle development
term:
id: GO:0001942
label: hair follicle development
evidence:
- reference: PMID:33666111
reference_title: "Histologic features of hair follicle neoplasms and cysts in dogs and cats: a diagnostic guide."
supports: SUPPORT
evidence_source: MODEL_ORGANISM
snippet: "follicular tumors are classified according to the differentiation pattern seen in the corresponding part of the normal hair follicle"
explanation: >
Supports that dermoid/follicular cysts recapitulate the differentiation
pattern of mature hair follicle structures (this veterinary diagnostic
guide describes follicular cysts including dermoid cysts in dogs and cats).
downstream:
- target: Slowly Enlarging Cystic Mass
description: >
Continued accumulation of keratin, sebaceous material, and hair within the
epithelial-lined cyst causes gradual enlargement of a mass lesion.
causal_link_type: DIRECT
- target: Ovarian dermoid cyst
description: >
Mature tri-lineage tissue forming a unilocular cyst at the ovary is the
defining ovarian dermoid cyst lesion.
causal_link_type: DIRECT
- target: Intracranial dermoid cyst
description: >
Ectoderm entrapped along the CNS midline differentiates into a dermoid cyst
within the cranium.
causal_link_type: DIRECT
- target: Nasal dermoid cyst
description: >
Ectoderm entrapped during nasal midline fusion forms a nasal dermoid sinus
cyst.
causal_link_type: DIRECT
- target: Limbal dermoid
description: >
Ectodermal differentiation at the ocular surface forms a limbal/epibulbar
dermoid (choristoma).
causal_link_type: DIRECT
- name: Aberrant Embryonic Midline Fusion and Ectodermal Entrapment
description: >
For craniofacial, nasal, orbital, ocular-surface, and cutaneous dermoid
cysts, the lesion arises developmentally rather than from a germ cell.
Surface ectoderm becomes entrapped during fusion of the facial prominences
and midline seam closure (the ectodermal-inclusion and embryonic
closure-defect theories), producing an epithelial-lined cavity that contains
epidermis, dermis, and adnexal structures. Nasal dermoids may retain a sinus
tract and, in a subset, intracranial extension.
biological_processes:
- preferred_term: multicellular organism development
term:
id: GO:0007275
label: multicellular organism development
modifier: ABNORMAL
evidence:
- reference: PMID:41585020
reference_title: "Pediatric nasal dermoid sinus cysts: advances in pathogenesis, management strategies, and translational research-a multidisciplinary management perspective."
supports: SUPPORT
evidence_source: HUMAN_CLINICAL
snippet: "Aberrant midline fusion and ectodermal inclusion during embryogenesis represent the principal pathogenic theories"
explanation: >
States the two principal embryologic theories for craniofacial/nasal
dermoid cyst formation: aberrant midline fusion and ectodermal inclusion.
- reference: PMID:37685334
reference_title: "The Differential Diagnosis of Congenital Developmental Midline Nasal Masses: Histopathological, Clinical, and Radiological Aspects."
supports: SUPPORT
evidence_source: HUMAN_CLINICAL
snippet: "Developmental midline nasal masses including nasal dermoids (NDs), encephaloceles (EPHCs), and nasal glial heterotopias (NGHs) are a consequence of disrupted embryonal developmental processes in the frontonasal region."
explanation: >
Supports the developmental, midline-fusion origin of nasal dermoid cysts.
downstream:
- target: Mature Tri-Lineage Tissue Differentiation
description: >
Entrapped ectoderm differentiates in situ into the mature epidermis,
dermis, and skin appendages that constitute the dermoid cyst.
causal_link_type: DIRECT
- name: Slowly Enlarging Cystic Mass
description: >
The dermoid cyst is a slow-growing, chronic lesion that gradually enlarges
and does not spontaneously resolve. Enlargement and the dependent position of
the ovarian mass predispose to mechanical complications (ovarian torsion,
rupture) and, at intracranial and craniofacial sites, mass effect and
infection. Persistence over years also underlies the rare late malignant
transformation.
evidence:
- reference: PMID:39867042
reference_title: "Squamous Cell Carcinoma Originating From Mature Cystic Teratoma of the Ovary Diagnosed 10 Years After Initial Tumor Detection: A Case Report."
supports: SUPPORT
evidence_source: HUMAN_CLINICAL
snippet: "Magnetic resonance imaging performed at another Department of Internal Medicine 10 years ago revealed a left ovarian teratoma measuring 8 cm"
explanation: >
Documents a slow-growing ovarian dermoid that enlarged over a decade,
supporting the chronic, gradually enlarging course.
downstream:
- target: Pelvic pain
description: >
An enlarging or complicated ovarian dermoid cyst produces pelvic pain.
causal_link_type: DIRECT
- target: Abdominal mass
description: >
A large ovarian dermoid presents as a palpable abdominal/pelvic mass.
causal_link_type: DIRECT
- target: Headache
description: >
An enlarging intracranial dermoid cyst causes headache through mass effect.
causal_link_type: INDIRECT_KNOWN_INTERMEDIATES
- target: Cyst Rupture and Chemical Aseptic Meningitis
description: >
An enlarging intracranial dermoid cyst is prone to rupture, releasing
lipid contents.
causal_link_type: INDIRECT_KNOWN_INTERMEDIATES
- target: Malignant Transformation
description: >
Long-standing ovarian mature cystic teratomas rarely undergo malignant
transformation of the squamous lining.
causal_link_type: INDIRECT_UNKNOWN_INTERMEDIATES
- name: Cyst Rupture and Chemical Aseptic Meningitis
description: >
Rupture of an intracranial dermoid cyst releases lipid-rich keratinaceous
contents into the subarachnoid space, provoking a chemical (aseptic)
inflammatory meningitis affecting the meninges and adjacent cortex. Rupture
of an ovarian dermoid likewise causes a chemical (granulomatous) peritonitis.
cell_types:
- preferred_term: keratinizing squamous epithelial cell
term:
id: CL:0000312
label: keratinocyte
downstream:
- target: Meningitis
description: >
Spillage of cyst lipid content into cerebrospinal fluid triggers a chemical
aseptic meningitis.
causal_link_type: DIRECT
- name: Malignant Transformation
description: >
In approximately 1-3% of ovarian mature cystic teratomas, the mature
squamous epithelial lining undergoes malignant transformation, most commonly
to squamous cell carcinoma. This is a late, rare complication, more frequent
in older (postmenopausal) women and large or long-standing lesions.
cell_types:
- preferred_term: keratinizing squamous epithelial cell
term:
id: CL:0000312
label: keratinocyte
evidence:
- reference: PMID:39867042
reference_title: "Squamous Cell Carcinoma Originating From Mature Cystic Teratoma of the Ovary Diagnosed 10 Years After Initial Tumor Detection: A Case Report."
supports: SUPPORT
evidence_source: HUMAN_CLINICAL
snippet: "Malignant transformation is a rare complication of ovarian mature cystic teratoma that occurs in 1-3% of cases."
explanation: >
Documents that malignant transformation of ovarian mature cystic teratoma
occurs in 1-3% of cases.
- reference: PMID:39867042
reference_title: "Squamous Cell Carcinoma Originating From Mature Cystic Teratoma of the Ovary Diagnosed 10 Years After Initial Tumor Detection: A Case Report."
supports: SUPPORT
evidence_source: HUMAN_CLINICAL
snippet: "A histological examination revealed that part of the thickened cyst wall was lined by squamous cell carcinoma in situ."
explanation: >
Documents squamous cell carcinoma as the histology of malignant
transformation arising from the dermoid cyst wall.
downstream:
- target: Carcinoma
description: >
The transformed squamous lining gives rise to an invasive squamous cell
carcinoma.
causal_link_type: DIRECT
- name: Paraneoplastic Anti-NMDAR Encephalitis Association
description: >
Ovarian teratomas (including mature/dermoid teratomas containing neural
tissue) are the commonest tumor associated with anti-N-methyl-D-aspartate
receptor (anti-NMDAR) encephalitis, a paraneoplastic autoimmune syndrome.
Neural tissue within the teratoma is thought to trigger an autoimmune
response against NMDA receptors; tumor removal is a central component of
treatment.
evidence:
- reference: PMID:42361457
reference_title: "Ovarian teratoma and the anti-N-methyl-D-aspartate receptor encephalitis paraneoplastic phenomenon: A systematic review and analysis of the literature."
supports: SUPPORT
evidence_source: HUMAN_CLINICAL
snippet: "Anti-N-methyl-D-aspartate receptor (anti-NMDAR) encephalitis is the commonest GCT-associated paraneoplastic syndrome."
explanation: >
Establishes anti-NMDAR encephalitis as the most common germ-cell-tumor
(including ovarian teratoma) associated paraneoplastic syndrome.
- reference: PMID:42361457
reference_title: "Ovarian teratoma and the anti-N-methyl-D-aspartate receptor encephalitis paraneoplastic phenomenon: A systematic review and analysis of the literature."
supports: SUPPORT
evidence_source: HUMAN_CLINICAL
snippet: "Where possible, ovarian-sparing surgery should be offered."
explanation: >
Supports that surgical removal of the ovarian teratoma is central to
management of the associated anti-NMDAR encephalitis.
downstream:
- target: Seizure
description: >
Anti-NMDAR encephalitis associated with ovarian teratoma commonly produces
neuropsychiatric features and seizures.
causal_link_type: INDIRECT_KNOWN_INTERMEDIATES
phenotypes:
- category: Clinical
name: Ovarian dermoid cyst
description: >
A mature cystic teratoma of the ovary, the prototypical and most common
dermoid cyst; often an asymptomatic adnexal mass discovered incidentally.
phenotype_term:
preferred_term: Ovarian dermoid cyst
term:
id: HP:0025274
label: Ovarian dermoid cyst
evidence:
- reference: PMID:37372675
reference_title: "Clinical Challenges in the Management of Malignant Ovarian Germ Cell Tumours."
supports: SUPPORT
evidence_source: HUMAN_CLINICAL
snippet: "They are histologically classified into primitive GCT, teratomas, and monodermal and somatic-type tumours associated with dermoid cysts."
explanation: >
Supports the ovarian dermoid cyst (mature teratoma) as a recognized
ovarian germ cell tumor entity.
- category: Clinical
name: Ovarian teratoma
description: >
The broader ovarian teratoma phenotype encompassing mature (benign) and
immature forms; the mature cystic form is the dermoid cyst.
phenotype_term:
preferred_term: Ovarian teratoma
term:
id: HP:0012226
label: Ovarian teratoma
evidence:
- reference: PMID:37174909
reference_title: "Immature Teratoma: Diagnosis and Management-A Review of the Literature."
supports: SUPPORT
evidence_source: HUMAN_CLINICAL
snippet: "It is the second most frequent among the malignant germinal tumors after dysgerminoma, and it is the only neoplasm with germ cells that are histologically graded."
explanation: >
Characterizes ovarian teratoma among germ cell tumors of the ovary.
- category: Clinical
name: Intracranial dermoid cyst
description: >
A congenital intracranial dermoid cyst, a rare benign CNS lesion that may
present with headache, seizures, and signs of mass effect; rupture can cause
chemical meningitis.
phenotype_term:
preferred_term: Intracranial dermoid cyst
term:
id: HP:0012097
label: Intracranial dermoid cyst
evidence:
- reference: PMID:37685334
reference_title: "The Differential Diagnosis of Congenital Developmental Midline Nasal Masses: Histopathological, Clinical, and Radiological Aspects."
supports: PARTIAL
evidence_source: HUMAN_CLINICAL
snippet: "meticulous preoperative differential diagnostics is mandatory"
explanation: >
Supports the clinical recognition of congenital developmental dermoid
lesions requiring careful diagnosis. Site-specific intracranial frequency
is documented in the narrative research report (Soto 2025).
- category: Clinical
name: Nasal dermoid cyst
description: >
A congenital nasal dermoid sinus cyst, the most common congenital midline
nasal mass; presents as a painless midline mass, sometimes with a sinus
opening and visible hair, and carries a high risk of recurrent infection.
phenotype_term:
preferred_term: Nasal dermoid cyst
term:
id: HP:0430145
label: Nasal dermoid cyst
evidence:
- reference: PMID:41585020
reference_title: "Pediatric nasal dermoid sinus cysts: advances in pathogenesis, management strategies, and translational research-a multidisciplinary management perspective."
supports: SUPPORT
evidence_source: HUMAN_CLINICAL
snippet: "Pediatric nasal dermoid/sinus cysts (NDSC) are common congenital midline craniofacial lesions associated with embryonic tissue entrapment and abnormal midline fusion during embryogenesis"
explanation: >
Supports nasal dermoid sinus cyst as a common congenital midline
craniofacial lesion.
- reference: PMID:41585020
reference_title: "Pediatric nasal dermoid sinus cysts: advances in pathogenesis, management strategies, and translational research-a multidisciplinary management perspective."
supports: SUPPORT
evidence_source: HUMAN_CLINICAL
snippet: "they can involve intracranial structures and predispose patients to recurrent infection, intracranial complications, and cosmetic or functional impairment"
explanation: >
Documents the infection risk, intracranial extension, and cosmetic/functional
morbidity of nasal dermoid sinus cysts.
- category: Clinical
name: Limbal dermoid
description: >
A congenital ocular-surface (limbal/epibulbar) dermoid choristoma that may
induce astigmatism and visual disturbance.
phenotype_term:
preferred_term: Limbal dermoid
term:
id: HP:0001140
label: Limbal dermoid
- category: Clinical
name: Pelvic pain
description: >
Larger or complicated ovarian dermoid cysts may present with pelvic pain.
phenotype_term:
preferred_term: Pelvic pain
term:
id: HP:0034267
label: Pelvic pain
- category: Clinical
name: Abdominal mass
description: >
A large ovarian dermoid cyst can present as a palpable abdominal/pelvic mass.
phenotype_term:
preferred_term: Abdominal mass
term:
id: HP:0031500
label: Abdominal mass
evidence:
- reference: PMID:39867042
reference_title: "Squamous Cell Carcinoma Originating From Mature Cystic Teratoma of the Ovary Diagnosed 10 Years After Initial Tumor Detection: A Case Report."
supports: SUPPORT
evidence_source: HUMAN_CLINICAL
snippet: "The current plane magnetic resonance imaging showed a large pelvic-abdominal cystic tumor measuring 17 cm, consisting of fat, fluid-fluid level, and a hair ball."
explanation: >
Documents a large ovarian dermoid presenting as a pelvic-abdominal cystic
mass.
- category: Clinical
name: Headache
description: >
Intracranial dermoid cysts frequently present with headache.
phenotype_term:
preferred_term: Headache
term:
id: HP:0002315
label: Headache
evidence:
- reference: PMID:37685334
reference_title: "The Differential Diagnosis of Congenital Developmental Midline Nasal Masses: Histopathological, Clinical, and Radiological Aspects."
supports: PARTIAL
evidence_source: HUMAN_CLINICAL
snippet: "Surgery is the only method of treatment in order to prevent local and intracranial inflammatory complications as well as distant deformities of the facial skeleton."
explanation: >
Indirect support for intracranial complications of midline dermoid
lesions. Headache as a presenting symptom of intracranial dermoid cysts is
documented in the narrative research report (Soto 2025).
- category: Clinical
name: Seizure
description: >
Intracranial dermoid cysts may present with seizures, including acute
symptomatic seizures following rupture; seizures also occur in
teratoma-associated anti-NMDAR encephalitis.
phenotype_term:
preferred_term: Seizure
term:
id: HP:0001250
label: Seizure
evidence:
- reference: PMID:42361457
reference_title: "Ovarian teratoma and the anti-N-methyl-D-aspartate receptor encephalitis paraneoplastic phenomenon: A systematic review and analysis of the literature."
supports: PARTIAL
evidence_source: HUMAN_CLINICAL
snippet: "Paraneoplastic syndromes occurring with germ-cell-tumors (GCTs) are rare but can be life-threatening."
explanation: >
Indirect support for the neurological morbidity of teratoma-associated
paraneoplastic syndromes, of which seizures are a feature.
- category: Clinical
name: Meningitis
description: >
Rupture of an intracranial dermoid cyst can cause chemical aseptic
meningitis from release of lipid contents into the cerebrospinal fluid.
phenotype_term:
preferred_term: Meningitis
term:
id: HP:0001287
label: Meningitis
evidence:
- reference: PMID:37685334
reference_title: "The Differential Diagnosis of Congenital Developmental Midline Nasal Masses: Histopathological, Clinical, and Radiological Aspects."
supports: PARTIAL
evidence_source: HUMAN_CLINICAL
snippet: "Surgery is the only method of treatment in order to prevent local and intracranial inflammatory complications"
explanation: >
Supports the risk of intracranial inflammatory complications from midline
dermoid lesions; chemical aseptic meningitis on intracranial rupture is
detailed in the narrative research report.
- category: Clinical
name: Carcinoma
description: >
Squamous cell carcinoma arising by malignant transformation of an ovarian
mature cystic teratoma (~1-3% of cases).
phenotype_term:
preferred_term: Carcinoma
term:
id: HP:0030731
label: Carcinoma
evidence:
- reference: PMID:39867042
reference_title: "Squamous Cell Carcinoma Originating From Mature Cystic Teratoma of the Ovary Diagnosed 10 Years After Initial Tumor Detection: A Case Report."
supports: SUPPORT
evidence_source: HUMAN_CLINICAL
snippet: "We diagnosed this tumor as squamous cell carcinoma originating from mature cystic teratoma of the left ovary."
explanation: >
Documents squamous cell carcinoma arising from malignant transformation of
an ovarian mature cystic teratoma.
genetic:
- name: BMP15 germline mutation (hereditary ovarian teratoma)
gene_term:
preferred_term: BMP15
term:
id: hgnc:1068
label: BMP15
inheritance:
- name: X-linked dominant
features: >
A rare germline BMP15 missense mutation (C262T; p.Arg88Cys) causes a
hereditary, X-linked dominant form of ovarian immature teratoma affecting
heterozygous female carriers. Most dermoid cysts are sporadic; this gene is
relevant only to the rare hereditary ovarian teratoma form.
evidence:
- reference: PMID:38427603
reference_title: "A rare germline BMP15 missense mutation causes hereditary ovarian immature teratoma in human."
supports: SUPPORT
evidence_source: HUMAN_CLINICAL
snippet: "BMP15 was identified as a pathogenic gene for OIT which improved our understanding of the etiology of OIT and provided a potential biomarker for genetic screening of this disorder."
explanation: >
Establishes BMP15 as a pathogenic gene for hereditary ovarian immature
teratoma and a candidate genetic-screening biomarker.
treatments:
- name: Surgical Excision
description: >
Complete surgical excision is the definitive treatment across all dermoid
cyst subtypes. For ovarian dermoid cysts, fertility-sparing cystectomy or
oophorectomy is performed, commonly via laparoscopy. Intracranial lesions
require neurosurgical resection (gross total resection minimizes recurrence);
nasal dermoid sinus cysts require complete excision of the cyst and tract.
Completeness of resection is the primary determinant of recurrence.
treatment_term:
preferred_term: surgical procedure
term:
id: MAXO:0000004
label: surgical procedure
evidence:
- reference: PMID:41585020
reference_title: "Pediatric nasal dermoid sinus cysts: advances in pathogenesis, management strategies, and translational research-a multidisciplinary management perspective."
supports: SUPPORT
evidence_source: HUMAN_CLINICAL
snippet: "Treatment centers on complete excision"
explanation: >
Supports complete surgical excision as the central treatment for dermoid
sinus cysts.
- reference: PMID:37174909
reference_title: "Immature Teratoma: Diagnosis and Management-A Review of the Literature."
supports: SUPPORT
evidence_source: HUMAN_CLINICAL
snippet: "the main therapy is fertility-sparing surgery"
explanation: >
Supports fertility-sparing surgery as the main therapy for ovarian
teratomas.
- name: Oophorectomy / Ovarian Cystectomy
description: >
For ovarian dermoid cysts, removal of the cyst (cystectomy) or the ovary
(oophorectomy) is performed; ovarian-sparing approaches are preferred where
feasible to preserve fertility.
treatment_term:
preferred_term: oophorectomy
term:
id: MAXO:0001067
label: oophorectomy
evidence:
- reference: PMID:42361457
reference_title: "Ovarian teratoma and the anti-N-methyl-D-aspartate receptor encephalitis paraneoplastic phenomenon: A systematic review and analysis of the literature."
supports: SUPPORT
evidence_source: HUMAN_CLINICAL
snippet: "There was no difference in outcomes for those patients with oophorectomies compared with ovarian-sparing surgery."
explanation: >
Supports oophorectomy and ovarian-sparing surgery as the surgical options
for ovarian teratoma.
- name: Laparoscopic Surgery
description: >
Laparoscopy is commonly used for resection of ovarian dermoid cysts when
feasible.
treatment_term:
preferred_term: laparoscopy
term:
id: MAXO:0001188
label: laparoscopy
evidence:
- reference: PMID:37174909
reference_title: "Immature Teratoma: Diagnosis and Management-A Review of the Literature."
supports: PARTIAL
evidence_source: HUMAN_CLINICAL
snippet: "the main therapy is fertility-sparing surgery"
explanation: >
Supports surgical management of ovarian teratoma; the laparoscopic route is
documented in the narrative research report.
datasets: []
Dermoid cysts are benign developmental lesions that originate from ectodermal cells trapped during embryogenesis. They are composed of mature ectodermal derivatives and are histologically lined by keratinizing squamous epithelium containing adnexal structures such as sebaceous glands, hair follicles, and sweat glands (quan2026pediatricnasaldermoid pages 2-3, wiener2021histologicfeaturesof pages 14-16). Dermoid cysts differ from epidermoid cysts, which lack dermal appendages, and from teratomas, which arise from pluripotent germ cells and may contain elements of all three embryonic germ layers (soto2025presentationofa pages 1-3). The term "dermoid cyst" encompasses a heterogeneous group of lesions occurring at various anatomical sites, including the ovary (where mature cystic teratoma is the most common usage), the craniofacial region (nasal, orbital/periorbital), the central nervous system (intracranial, spinal), the skin/subcutaneous tissue, and the ocular surface (limbal/epibulbar).
Information is derived from aggregated disease-level resources, including published peer-reviewed literature, clinical trial registries, and veterinary pathology databases.
The following table provides a comparative overview of dermoid cysts by anatomical location:
| Anatomical Site | Frequency/Prevalence | Typical Age of Onset | Key Clinical Features | Primary Diagnostic Modality | Primary Treatment |
|---|---|---|---|---|---|
| Ovarian (mature cystic teratoma / dermoid cyst) | Ovarian germ cell tumors represent ~2–5% of ovarian cancers; mature teratoma is the benign teratoma subtype and one of the common ovarian germ-cell lesions in children, adolescents, and young adults (saani2023clinicalchallengesin pages 9-10, pinto2023molecularbiologyof pages 1-3) | Usually reproductive age; often children, adolescents, and young adults for ovarian germ-cell tumors (pinto2023molecularbiologyof pages 1-3) | Often asymptomatic until large; may present with adnexal mass, pelvic pain, torsion, rupture, or rarely malignant transformation; histologically a mature teratoma is a dermoid cyst (moraru2023immatureteratomadiagnosis pages 2-4, saani2023clinicalchallengesin pages 9-10) | Pelvic ultrasound first-line; CT/MRI used for characterization of fat/calcification and complications; definitive diagnosis by histopathology after excision (moraru2023immatureteratomadiagnosis pages 2-4) | Surgical excision, usually fertility-sparing cystectomy/oophorectomy; laparoscopy commonly used when feasible (NCT06816316 chunk 2) |
| Intracranial | Rare benign tumor comprising ~0.04–0.6% of brain tumors (soto2025presentationofa pages 1-3) | Congenital in origin but often diagnosed in young adults, especially ages 20–30 for suprasellar supratentorial lesions; can occur from childhood to adulthood (soto2025presentationofa pages 1-3, soto2025presentationofa pages 6-8) | Headache, seizures, dizziness/vertigo, visual symptoms; rupture may cause chemical aseptic meningitis and acute symptomatic seizures (soto2025presentationofa pages 1-3, soto2025presentationofa pages 6-8) | MRI is primary and essential for diagnosis and surgical planning; CT may assist in lesion characterization (soto2025presentationofa pages 6-8, soto2025presentationofa pages 8-10) | Neurosurgical excision aiming for gross total resection when safely possible; subtotal resection may be necessary near critical neurovascular structures (soto2025presentationofa pages 8-10, soto2025presentationofa pages 1-3) |
| Nasal / craniofacial | Nasal dermoids account for at least 60% of congenital developmental midline nasal masses; intracranial involvement occurs in ~20% overall, with wide reported range (4–57%) (kotowski2023thedifferentialdiagnosis pages 2-5) | Congenital; usually recognized in infancy or childhood (quan2026pediatricnasaldermoid pages 2-3, kotowski2023thedifferentialdiagnosis pages 2-5) | Painless noncompressible midline nasal mass; sinus opening with visible hair may be present; recurrent local infection possible, with substantial childhood infection risk when a sinus ostium is present (quan2026pediatricnasaldermoid pages 2-3, kotowski2023thedifferentialdiagnosis pages 2-5) | MRI preferred for defining soft-tissue tract and intracranial extension; CT complements osseous assessment; biopsy is contraindicated (deftereou2025congenitalanomaliesof pages 6-6, quan2026pediatricnasaldermoid pages 4-5) | Complete surgical excision of cyst and tract; external rhinoplasty, endoscopic, or combined craniofacial approaches depending on extension (quan2026pediatricnasaldermoid pages 8-9, quan2026pediatricnasaldermoid pages 10-11) |
| Orbital / periorbital | Common congenital craniofacial dermoid location; literature in this evidence set is mainly case-series/review based rather than population-based, so precise prevalence not established here (soto2025presentationofa pages 6-8, quan2026pediatricnasaldermoid pages 8-9) | Usually congenital and detected in infancy or childhood (quan2026pediatricnasaldermoid pages 8-9) | Superolateral brow/orbital mass, usually painless and slowly enlarging; cosmetic deformity, local pressure effects, and occasional rupture/inflammation may occur (quan2026pediatricnasaldermoid pages 8-9, NCT06816316 chunk 2) | Clinical examination with imaging when deep lesion suspected; MRI/CT used to define orbital extension and surgical anatomy (NCT06816316 chunk 2) | Complete surgical excision; careful removal needed to avoid rupture and recurrence (NCT06816316 chunk 2) |
| Cutaneous / subcutaneous | Developmental anomaly rather than true neoplasm; human population prevalence not well defined in this evidence set (wiener2021histologicfeaturesof pages 14-16, wiener2021histologicfeaturesof pages 16-18) | Congenital, though superficial lesions may be recognized later depending on size/location (wiener2021histologicfeaturesof pages 14-16) | Small dermal/subcutaneous cyst containing keratin, hair, and sebaceous material; often solitary, slow-growing, and sometimes with a surface pore or protruding hair (wiener2021histologicfeaturesof pages 14-16, wiener2021histologicfeaturesof pages 16-18) | Clinical examination with confirmation by histopathology after excision; imaging only if deep extension suspected (wiener2021histologicfeaturesof pages 14-16, wiener2021histologicfeaturesof pages 16-18) | Complete surgical excision (wiener2021histologicfeaturesof pages 16-18) |
| Limbal / epibulbar | Rare ocular surface choristoma/dermoid subtype; no robust prevalence estimate in this evidence set (NCT06816316 chunk 2) | Congenital, typically identified in childhood (NCT06816316 chunk 2) | Visible limbal or epibulbar mass; may induce astigmatism, visual disturbance, irritation, or cosmetic concern (NCT06816316 chunk 2) | Ophthalmologic slit-lamp examination; imaging used selectively for extent/depth; diagnosis confirmed clinically and histopathologically when excised (NCT06816316 chunk 2) | Observation for small asymptomatic lesions or surgical excision/lamellar keratoplasty/corneal autograft in visually significant cases (NCT06816316 chunk 2) |
Table: This table summarizes how dermoid cysts differ by anatomical site, including frequency, age at presentation, clinical features, diagnostic approach, and treatment. It is useful for comparing the major clinically relevant dermoid cyst subtypes in one place.
The primary etiology of dermoid cysts is developmental: they arise from ectodermal tissue entrapped during embryogenesis. For craniofacial dermoid cysts, two principal pathogenetic theories exist: (1) the ectodermal inclusion theory, in which surface ectoderm becomes entrapped during fusion of facial prominences, and (2) the embryonic closure-defect theory, involving extensive midline seam closure failure (quan2026pediatricnasaldermoid pages 2-3). For cutaneous dermoid cysts, incomplete separation of cutaneous ectoderm and neuroectoderm during embryogenesis results in focal skin reduplications that include epidermis, dermis, and adnexal structures (wiener2021histologicfeaturesof pages 14-16).
For ovarian dermoid cysts (mature cystic teratomas), the origin is parthenogenetic: tumors arise from a single ovarian germ cell/oocyte, typically after completed meiosis I with failed meiosis II, producing homozygous chromosomes and containing only maternal genomes (moraru2023immatureteratomadiagnosis pages 2-4, pinto2023molecularbiologyof pages 7-9).
A landmark study published in PNAS in 2024 identified a rare germline BMP15 missense mutation (C262T) as a causative variant for hereditary ovarian immature teratoma (OIT). This mutation substitutes arginine with cysteine at position 88, reducing BMP15 secretion by 84.7%, and displays X-linked dominant inheritance affecting heterozygous female carriers (liu2024araregermline pages 3-4, liu2024araregermline pages 2-3). The mutation significantly increases spontaneous parthenogenetic activation rates of oocytes (8.4% for CC, 32.5% for CT, 51.3% for TT genotypes) (liu2024araregermline pages 2-3).
Gonadal dysgenesis is a recognized risk factor for malignant ovarian germ cell tumors (though not specifically for benign dermoid cysts), particularly in 46,XY individuals with Y chromosomal material, conferring a 30–40% risk of developing gonadoblastomas (pinto2023molecularbiologyof pages 3-4).
No specific environmental or lifestyle risk factors have been established for dermoid cyst formation, consistent with their congenital/developmental nature. Age and sex are the principal demographic risk factors: ovarian dermoid cysts predominantly affect reproductive-age women; nasal and orbital dermoid cysts are congenital and present in pediatric populations; and intracranial dermoid cysts show increased incidence in young adults aged 20–30 years (soto2025presentationofa pages 1-3, kotowski2023thedifferentialdiagnosis pages 2-5).
No specific genetic or environmental protective factors have been identified for dermoid cysts in the current literature.
No significant gene–environment interactions have been described for dermoid cyst formation. The condition is primarily of developmental/genetic origin.
Intracranial dermoid cysts present with headaches (67% of cases) and seizures (44%), including acute symptomatic seizures following cyst rupture and chronic epileptic seizures with impaired awareness. Dizziness, vertigo, and visual symptoms are also common. Cyst rupture may cause chemical aseptic meningitis due to release of lipid contents into cerebrospinal fluid (soto2025presentationofa pages 1-3, soto2025presentationofa pages 6-8, soto2025presentationofa pages 8-10). - Suggested HPO terms: HP:0002315 (Headache), HP:0001250 (Seizure), HP:0002383 (Encephalitis, for chemical meningitis), HP:0000238 (Hydrocephalus)
Nasal dermoid sinus cysts present as painless, non-compressible, non-pulsatile midline nasal masses that do not transilluminate. A sinus opening with visible hair may be present. Crucially, the presence of a sinus opening significantly increases infection risk, estimated at 7% per year during childhood, with 50% of children experiencing at least one infection by age 4 and over 90% by age 9 (kotowski2023thedifferentialdiagnosis pages 2-5). Intracranial involvement occurs in approximately 20% of cases (range 4–57%). Complications include local abscesses, periorbital cellulitis, osteomyelitis, meningitis, and cerebral abscesses (kotowski2023thedifferentialdiagnosis pages 2-5). - Suggested HPO terms: HP:0000431 (Wide nasal bridge, if applicable), HP:0010781 (Skin dimple), HP:0002090 (Pneumonia, for intracranial complications), HP:0040187 (Abnormality of the nose)
Ovarian dermoid cysts are often asymptomatic until they become large. They may present with pelvic pain, adnexal mass, or complications such as ovarian torsion, rupture, or (rarely, ~1–2%) malignant transformation (moraru2023immatureteratomadiagnosis pages 2-4). - Suggested HPO terms: HP:0000137 (Abnormality of the ovary), HP:0100607 (Dysmenorrhea), HP:0008675 (Enlarged ovaries)
Cutaneous dermoid cysts are typically solitary lesions less than 2 cm in diameter with a small pore that may contain protruding hair, located commonly on the dorsal midline (wiener2021histologicfeaturesof pages 14-16). - Suggested HPO terms: HP:0200040 (Skin cyst), HP:0001053 (Hypopigmented skin patches)
Intracranial dermoid cysts can significantly impair quality of life through chronic headaches, seizures, and neurological deficits. Nasal dermoid cysts in children carry a high risk of recurrent infection and cosmetic deformity, impacting psychosocial development. Ovarian dermoid cysts may affect fertility and cause anxiety regarding malignant potential. Specific QoL instrument data (EQ-5D, SF-36) specifically for dermoid cysts are limited in the current literature.
The following table summarizes the key molecular and genetic features of dermoid cysts/teratomas:
| Molecular Feature | Details/Findings | Relevant Gene/Pathway | Significance | Key Reference |
|---|---|---|---|---|
| Germline BMP15 missense mutation in hereditary ovarian teratoma | A rare BMP15 C262T missense variant was identified in two pedigrees with hereditary ovarian immature teratoma; the mutation reduces mature BMP15 secretion by ~84.7% and supports an X-linked dominant hereditary form affecting heterozygous females. | BMP15; oocyte growth factor signaling | Strongest recent human genetic evidence for a causal predisposition gene in hereditary ovarian teratoma; supports molecular diagnosis and genetic counseling in high-risk families. | PNAS 2024 BMP15 study (liu2024araregermline pages 3-4, liu2024araregermline pages 2-3, liu2024araregermline pages 1-2) |
| Parthenogenetic origin of ovarian teratomas | Mature ovarian teratomas are described as parthenogenetic tumors containing only maternal genomes; they are thought to arise from a single ovarian germ cell/oocyte after meiotic errors or spontaneous activation without fertilization. | Oocyte meiosis / parthenogenesis | Explains why many ovarian teratomas show near-diploid genomes with limited somatic mutation burden and distinctive imprinting features. | Diagnostics 2023; Cancers 2023; PNAS 2024 (moraru2023immatureteratomadiagnosis pages 2-4, pinto2023molecularbiologyof pages 7-9, liu2024araregermline pages 1-2) |
| H-Ras/MAPK pathway activation | In BMP15-mutant oocytes, spontaneous parthenogenetic activation increased markedly, accompanied by elevated H-Ras and MEK1 expression and MAPK pathway activation. | H-Ras, MEK1, MAPK signaling | Provides a mechanistic link between the BMP15 variant and abnormal oocyte activation leading to teratoma formation. | PNAS 2024 BMP15 study (liu2024araregermline pages 6-7, liu2024araregermline pages 4-6, liu2024araregermline pages 2-3) |
| GDF9/BMP15 signaling imbalance | The BMP15 variant may alter the balance between BMP15 homodimers/heterodimers and GDF9-related signaling, shifting downstream signaling outputs and enhancing pathways that favor parthenogenesis. | BMP15, GDF9, BMPR2, SMAD/MAPK-related signaling | Suggests that altered oocyte–granulosa cell signaling balance is an upstream event in hereditary teratoma pathogenesis. | PNAS 2024 BMP15 study (liu2024araregermline pages 6-7, liu2024araregermline pages 4-6, liu2024araregermline pages 7-8) |
| DNA methylation subtype differences | Ovarian germ cell tumors show subtype-specific methylation states: undifferentiated germinomas are relatively hypomethylated, whereas differentiated tumors including mature teratomas are more hypermethylated. | DNA methylation / epigenetic regulation | Supports the idea that differentiation state and cell of origin are reflected in methylation profiles; potentially useful for tumor classification and pathogenesis studies. | Cancers 2023 review (pinto2023molecularbiologyof pages 11-12, pinto2023molecularbiologyof pages 1-3, pinto2023molecularbiologyof pages 3-4) |
| Epigenetic imprinting abnormalities | Ovarian teratomas show abnormal imprinting patterns, including reduced methylation at paternally methylated loci and increased methylation at maternally methylated loci; IGF2/H19 imprinting abnormalities have also been reported in ovarian GCTs. | Genomic imprinting; IGF2/H19 control region | Reinforces the maternal-genome/parthenogenetic model and indicates that imprint erasure/re-establishment defects are central to teratoma biology. | Cancers 2023 review (pinto2023molecularbiologyof pages 11-12, pinto2023molecularbiologyof pages 3-4, moraru2023immatureteratomadiagnosis pages 13-15) |
| Chromosomal abnormality: isochromosome 12p / 12p gain | Gain of chromosome 12p, including isochromosome 12p, is frequent in malignant germ cell tumors, especially dysgerminomas and yolk-sac tumors, but is less characteristic of immature teratomas and generally absent from mature teratomas with normal karyotype. | 12p gain / i(12p) | Helps distinguish malignant ovarian GCT molecular pathways from the more parthenogenetic, usually cytogenetically bland pathway of mature teratoma/dermoid cyst. | Cancers 2023 review; IJERPH 2023 review (saani2023clinicalchallengesin pages 9-10, pinto2023molecularbiologyof pages 7-9) |
| Near-diploid genomes with limited somatic mutations | Immature teratomas may show near-diploid genomes, extensive allelic imbalance, and relative paucity of somatic mutations; mature teratomas often have normal karyotypes and arise after meiosis. | Meiotic nondisjunction; allelic imbalance | Indicates that abnormal germ-cell developmental/meiotic processes, rather than classic oncogenic mutation accumulation, drive teratoma formation. | Diagnostics 2023; Cancers 2023 (moraru2023immatureteratomadiagnosis pages 2-4, pinto2023molecularbiologyof pages 7-9, moraru2023immatureteratomadiagnosis pages 13-15) |
| Distinct pathogenetic pathway of immature teratoma | Immature teratomas appear to follow a pathogenetic route distinct from dysgerminoma/yolk-sac tumor and from some mature teratomas, with less emphasis on 12p gain and more on meiotic errors and epigenetic dysregulation. | Developmental germ-cell pathways | Important for biological classification, prognosis, and future risk stratification/targeted research. | Diagnostics 2023; IJERPH 2023; Cancers 2023 (moraru2023immatureteratomadiagnosis pages 2-4, saani2023clinicalchallengesin pages 9-10, pinto2023molecularbiologyof pages 7-9) |
Table: This table summarizes the main molecular and genetic findings relevant to ovarian dermoid cysts/teratomas, emphasizing recent evidence on BMP15-associated hereditary teratoma and broader germ-cell tumor epigenetics and cytogenetics. It is useful for distinguishing developmental/parthenogenetic mechanisms from malignant germ-cell tumor pathways.
BMP15 (Xp11.22; OMIM: 300247; HGNC:1068): A rare germline missense mutation BMP15 C262T (p.Arg88Cys) has been identified as the causative variant for hereditary ovarian immature teratoma with X-linked dominant inheritance. The mutation reduces mature BMP15 protein secretion by 84.7% and activates the H-Ras/MAPK signaling pathway, promoting parthenogenetic activation of oocytes (liu2024araregermline pages 3-4, liu2024araregermline pages 2-3, liu2024araregermline pages 1-2). This represents the first identified causal gene for hereditary ovarian teratoma in humans.
Mature ovarian teratomas typically have a normal karyotype (pinto2023molecularbiologyof pages 7-9). Gains on chromosome 12p, including isochromosome 12p (i(12p)), are characteristic of malignant germ cell tumors (82% of dysgerminomas, ~44% of all malignant GCTs) but are generally absent from mature teratomas and uncommon in pure immature teratomas (saani2023clinicalchallengesin pages 9-10, pinto2023molecularbiologyof pages 7-9). DNA ploidy analysis shows aneuploidy in 59% and diploidy in 41% of malignant GCT cases (saani2023clinicalchallengesin pages 9-10).
Distinct DNA methylation patterns characterize different germ cell tumor subtypes: undifferentiated GCTs (germinomas) are hypomethylated, while differentiated tumors including mature teratomas are hypermethylated (pinto2023molecularbiologyof pages 11-12). Ovarian teratomas show abnormal genomic imprinting with reduced methylation at paternally methylated loci and increased methylation at maternally methylated loci, consistent with their parthenogenetic origin. Abnormalities in the IGF2/H19 imprinting control region have been documented in ovarian GCTs (pinto2023molecularbiologyof pages 11-12, pinto2023molecularbiologyof pages 3-4).
No specific environmental toxins, radiation exposures, or occupational factors have been linked to dermoid cyst formation. These are congenital developmental lesions. No infectious agents are implicated in the formation of dermoid cysts, though secondary infection of nasal and craniofacial dermoid sinuses is a common complication (kotowski2023thedifferentialdiagnosis pages 2-5).
For ovarian dermoid cysts, the H-Ras/MAPK signaling pathway is a central mechanism in hereditary forms. The BMP15 C262T mutation leads to elevated H-Ras expression (3.2–8.3 fold) and MEK1 expression (3.9–5.8 fold) in mutant oocytes, promoting spontaneous parthenogenetic activation (liu2024araregermline pages 2-3). The mutation disrupts the balance between BMP15 and GDF9 signaling, altering SMAD2/3-MAPK pathway activation and shifting the ratio of heterodimeric signaling complexes (liu2024araregermline pages 6-7, liu2024araregermline pages 7-8). - GO terms: GO:0000187 (activation of MAPK activity), GO:0007049 (cell cycle), GO:0044703 (multi-organism reproductive process)
For craniofacial and cutaneous dermoid cysts, the mechanism involves aberrant midline fusion during embryogenesis with entrapment of ectodermal tissue. This results in formation of epithelial-lined cavities containing keratinaceous material (quan2026pediatricnasaldermoid pages 2-3, wiener2021histologicfeaturesof pages 14-16).
The key cellular process in ovarian dermoid cysts is parthenogenesis: spontaneous activation of oocytes without fertilization, leading to development of a tumor containing elements of all three germ layers. Mature teratomas develop from oocytes after completed meiosis I with failed meiosis II, producing near-diploid genomes with limited somatic mutations and extensive allelic imbalances (moraru2023immatureteratomadiagnosis pages 2-4, pinto2023molecularbiologyof pages 7-9). - GO terms: GO:0009566 (fertilization), GO:0007276 (gamete generation), GO:0051301 (cell division) - CL terms: CL:0000023 (oocyte), CL:0000501 (granulosa cell)
Intracranial dermoid cyst rupture releases lipid-rich contents into the subarachnoid space, causing chemical aseptic meningitis through inflammatory reactions affecting cortical regions and adjacent brain structures (soto2025presentationofa pages 8-10, soto2025presentationofa pages 1-3).
Primary organs: - Ovary (UBERON:0000992) — most common site for mature teratoma - Brain (UBERON:0000955) — intracranial dermoid cysts, representing 0.04–0.6% of brain tumors (soto2025presentationofa pages 1-3) - Nose (UBERON:0000004) — nasal dermoid sinus cysts, most common congenital midline nasal mass (kotowski2023thedifferentialdiagnosis pages 2-5) - Eye/Orbit (UBERON:0004088) — orbital/periorbital and limbal dermoids - Skin (UBERON:0002097) — cutaneous dermoid cysts
Secondary involvement: - Meninges (chemical meningitis from intracranial rupture) - Anterior cranial fossa (intracranial extension of nasal dermoids, ~20% of cases) (kotowski2023thedifferentialdiagnosis pages 2-5) - Spinal cord (spinal dermoid cysts; cutaneous dermoid sinuses may extend to spinal canal) (wiener2021histologicfeaturesof pages 14-16)
Dermoid cysts contain mature ectodermal derivatives: - Keratinizing squamous epithelium (CL:0000237, squamous epithelial cell) - Sebaceous glands (CL:0000317, sebum secreting cell) - Hair follicles - Apocrine glands - Dense collagen stroma arranged concentrically around the cyst wall (wiener2021histologicfeaturesof pages 14-16, wiener2021histologicfeaturesof pages 16-18)
Intracranial dermoid cysts are classified by location as: (1) invasive to adjacent structures, (2) intradural, and (3) intracavernous, with suprasellar supratentorial lesions being most common in young adults (soto2025presentationofa pages 1-3). Nasal dermoid cysts are classified as: (1) superficial (Type 1), (2) sinus-tract type, and (3) intracranially extending type (quan2026pediatricnasaldermoid pages 2-3, quan2026pediatricnasaldermoid pages 4-5). Dermoid cysts are typically midline lesions and can be unilateral or bilateral in paired structures (e.g., ovaries).
Dermoid cysts are congenital in origin, developing during embryogenesis (quan2026pediatricnasaldermoid pages 2-3, wiener2021histologicfeaturesof pages 14-16). However, clinical presentation varies by site: - Nasal/orbital dermoids: typically present in infancy/childhood - Intracranial dermoids: often diagnosed in young adults (20–30 years) (soto2025presentationofa pages 1-3) - Ovarian dermoid cysts: typically diagnosed in reproductive-age women - Cutaneous dermoids: variable age of recognition
Dermoid cysts are generally slow-growing, chronic lesions with a benign course. They do not spontaneously resolve and gradually enlarge over time. Critical complications include: - Ovarian torsion and rupture for ovarian dermoid cysts - Chemical meningitis from rupture of intracranial dermoid cysts (soto2025presentationofa pages 8-10) - Recurrent infections for nasal dermoid sinuses (7% annual infection risk) (kotowski2023thedifferentialdiagnosis pages 2-5) - Malignant transformation of ovarian mature teratomas occurs in approximately 1–2% of cases, typically squamous cell carcinoma
Recurrence after surgical excision depends on completeness of resection. For intracranial giant dermoid cysts, subtotal resection can lead to recurrence, as demonstrated by a case requiring two additional surgeries over 10 years, while gross total resection achieved no recurrence after 10 years of follow-up (soto2025presentationofa pages 1-3). For nasal dermoid cysts, recurrence is most commonly due to incomplete excision or involvement of fistulous tracts and cranial base (quan2026pediatricnasaldermoid pages 10-11).
Most dermoid cysts are sporadic and non-hereditary. However, hereditary ovarian immature teratoma has been identified with X-linked dominant inheritance associated with BMP15 C262T mutation, exclusively affecting heterozygous female carriers (liu2024araregermline pages 3-4, liu2024araregermline pages 2-3). The disease may be classified into hereditary and sporadic types (liu2024araregermline pages 8-9).
Dermoid cysts are lined by squamous epithelium with prominent keratohyalin granules, containing lamellar keratin, hair fragments, and sebaceous secretions, surrounded by dense collagen with parallel arrangement. Multiple well-differentiated hair follicles, sebaceous glands, and occasional apocrine glands radiate from the cyst wall (wiener2021histologicfeaturesof pages 16-18). Key differentiating features from infundibular cysts include more abundant adnexal structures and concentric collagen arrangement (wiener2021histologicfeaturesof pages 16-18). - SNOMED CT: 128978008 (Dermoid cyst)
Nasal dermoid cysts are characterized as non-expansile, non-pulsatile, non-compressible masses that do not transilluminate and produce a negative Furstenberg's sign (no enlargement with jugular vein compression or Valsalva maneuver) (kotowski2023thedifferentialdiagnosis pages 2-5). Biopsy is contraindicated for nasal dermoids (deftereou2025congenitalanomaliesof pages 6-6).
Genetic testing is not routinely indicated for sporadic dermoid cysts. For suspected hereditary ovarian teratoma, BMP15 mutation analysis may be considered as a potential biomarker for molecular diagnosis and genetic screening in high-risk families (liu2024araregermline pages 8-9, liu2024araregermline pages 7-8).
Dermoid cysts are benign lesions with excellent survival rates. Mature ovarian teratomas have an excellent overall survival rate following surgical excision, with fertility preservation possible through conservative surgery (moraru2023immatureteratomadiagnosis pages 2-4). Intracranial dermoid cysts carry minimal mortality risk when completely resected, but subtotal resection risks recurrence (soto2025presentationofa pages 1-3). Immature teratomas also have good prognoses, with excellent overall survival (moraru2023immatureteratomadiagnosis pages 2-4).
Completeness of surgical excision is the primary prognostic determinant. Gross total resection of intracranial dermoid cysts prevents recurrence (soto2025presentationofa pages 1-3). For nasal dermoid cysts, preoperative imaging to identify intracranial extension and meticulous complete excision reduce recurrence risk (quan2026pediatricnasaldermoid pages 8-9, quan2026pediatricnasaldermoid pages 10-11).
Surgery is the definitive treatment for all dermoid cyst subtypes:
Ovarian dermoid cysts: - Fertility-sparing cystectomy or oophorectomy, typically via laparoscopy (MAXO:0001185 — laparoscopic surgery) - Clinical trial NCT02009228 evaluated single-port laparoscopic cystectomy as potentially preferable for managing ovarian dermoid cysts (NCT06816316 chunk 2) - NCT05054946 evaluated the effect of laparoscopic surgery on ovarian reserve according to cyst type
Intracranial dermoid cysts: - Craniotomy (frontal, temporal, frontotemporal, or transcranial approaches) with goal of gross total resection (soto2025presentationofa pages 6-8, soto2025presentationofa pages 8-10) - Microsurgical techniques and advanced visualization (exoscope) are essential for safe resection near neurovascular structures (soto2025presentationofa pages 8-10) - The Reyes-Velez classification system has been proposed to guide surgical planning and predict complications (soto2025presentationofa pages 1-3)
Nasal dermoid sinus cysts: - External rhinoplasty approach for adequate exposure and en bloc removal (quan2026pediatricnasaldermoid pages 8-9) - Endoscopic endonasal techniques for selected cases - Combined intracranial–extracranial approaches for cases with intracranial extension (quan2026pediatricnasaldermoid pages 10-11) - Multidisciplinary team management (otolaryngology, neurosurgery, plastic surgery) is recommended (quan2026pediatricnasaldermoid pages 8-9, quan2026pediatricnasaldermoid pages 10-11)
Orbital dermoid cysts: - Complete excision avoiding rupture - Clinical trial NCT06816316 evaluated the role of 70% ethyl alcohol versus saline for intraoperative cleaning of accidentally opened angular dermoid cysts to prevent recurrence (NCT06816316 chunk 2)
Limbal dermoid cysts: - Observation for small asymptomatic lesions; corneal autograft or lamellar keratoplasty for visually significant lesions - Clinical trial NCT03217461 evaluated corneal autograft for limbal dermoid
Long-term follow-up of 1–3 years with imaging surveillance is recommended after nasal dermoid cyst excision (quan2026pediatricnasaldermoid pages 10-11). Perioperative infection control is critical for nasal dermoid sinuses (quan2026pediatricnasaldermoid pages 8-9).
No primary prevention strategies exist for dermoid cysts, as they are congenital developmental lesions.
For nasal dermoid sinus cysts, early surgical excision is recommended to prevent the cumulative infection risk (7% per year) and potential intracranial complications (kotowski2023thedifferentialdiagnosis pages 2-5). Prenatal imaging may detect some ovarian cysts, but prenatal detection of dermoid cysts specifically is uncommon.
For families with hereditary ovarian teratoma, BMP15 mutation analysis may facilitate identification of at-risk heterozygous female carriers and enable genetic counseling and surveillance (liu2024araregermline pages 8-9, liu2024araregermline pages 7-8).
Complete surgical excision is the key strategy for preventing complications and recurrence. Standardized follow-up protocols with imaging reduce the risk of missed recurrence (quan2026pediatricnasaldermoid pages 10-11).
Dermoid cysts occur naturally in dogs and are more common than in cats. They represent focal reduplications of skin resulting from developmental anomalies and primarily affect young animals under 2 years of age (wiener2021histologicfeaturesof pages 14-16). Breed predisposition exists, particularly in: - Rhodesian Ridgeback — often multiple dorsal midline cysts (dermoid sinuses) - Boxer - Kerry Blue Terrier - English Bulldog - Shih Tzu - Saint Bernard — documented with multiple dermoid sinuses on the head (wiener2021histologicfeaturesof pages 19-19)
Lesions are most commonly located on the dorsal midline but can extend to the spinal canal and dura mater (wiener2021histologicfeaturesof pages 14-16). The VBO identifier for Rhodesian Ridgeback is VBO:0200817.
Dermoid cysts in cats are less common than in dogs and are particularly found on the lateral neck or shoulder (wiener2021histologicfeaturesof pages 16-18). Histologically, they are identical to canine dermoid cysts.
Ovarian teratomas occur naturally in nonhuman primates, with most ovarian tumors reported in baboons (Papio spp.) (wiener2021histologicfeaturesof pages 14-16).
A CRISPR/Cas9-engineered Bmp15 R86C knock-in mouse model (C57BL/6 background) has been developed to study hereditary ovarian teratoma. Mice carrying the mutation (equivalent to human BMP15 R88C) show significantly increased spontaneous parthenogenetic activation of oocytes, with one transgenic mouse developing an OIT phenotype by 6 months. The mutation causes ovarian overgrowth (>2-fold larger than wild-type) (liu2024araregermline pages 4-6, liu2024araregermline pages 8-8). This model recapitulates key aspects of the human disease.
The Bmp15 mutant mouse model enables investigation of: - Parthenogenetic mechanisms of teratoma formation - BMP15/GDF9 signaling balance in oocyte development - Preclinical testing of potential preventive interventions - Validation of genetic biomarkers for screening (liu2024araregermline pages 8-9)
Rhodesian Ridgeback dermoid sinuses serve as natural models for studying congenital dermoid cyst pathogenesis, with well-documented breed predisposition and dorsal midline localization paralleling human nasal/spinal dermoid sinuses (wiener2021histologicfeaturesof pages 14-16).
Dermoid cysts are a heterogeneous group of benign developmental lesions arising from ectodermal tissue entrapment during embryogenesis. They occur at diverse anatomical sites including the ovary (as mature cystic teratomas), cranium, nasal midline, orbit, skin, and ocular surface. The molecular understanding of ovarian dermoid cysts has been significantly advanced by the 2024 identification of a causal BMP15 germline mutation causing hereditary ovarian teratoma through enhanced oocyte parthenogenetic activation via H-Ras/MAPK pathway dysregulation (liu2024araregermline pages 3-4, liu2024araregermline pages 2-3). Epigenetic studies reveal distinct DNA methylation patterns in germ cell tumor subtypes, with mature teratomas showing characteristic imprinting abnormalities consistent with their parthenogenetic origin (pinto2023molecularbiologyof pages 11-12). Surgical excision remains the definitive treatment across all anatomical subtypes, with completeness of resection being the primary determinant of recurrence and long-term outcome (soto2025presentationofa pages 1-3, quan2026pediatricnasaldermoid pages 10-11). Nasal dermoid sinuses carry significant childhood infection risk (50% by age 4) warranting early intervention (kotowski2023thedifferentialdiagnosis pages 2-5). Intracranial dermoid cysts, though rare (0.04–0.6% of brain tumors), require careful neurosurgical planning due to potential for chemical meningitis upon rupture (soto2025presentationofa pages 1-3, soto2025presentationofa pages 8-10). Natural models in dogs (particularly Rhodesian Ridgebacks) and the CRISPR-engineered Bmp15 mutant mouse provide valuable platforms for studying dermoid cyst pathogenesis across species (wiener2021histologicfeaturesof pages 14-16, liu2024araregermline pages 8-8).
References
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(moraru2023immatureteratomadiagnosis pages 13-15): Liviu Moraru, Melinda-Ildiko Mitranovici, Diana Maria Chiorean, Marius Coroș, Raluca Moraru, Ioan Emilian Oală, and Sabin Gligore Turdean. Immature teratoma: diagnosis and management—a review of the literature. Diagnostics, 13:1516, Apr 2023. URL: https://doi.org/10.3390/diagnostics13091516, doi:10.3390/diagnostics13091516. This article has 68 citations.
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