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{{infobox Disease
{{Infobox Disease
|Title              =  
|name = Nasal Dermoid Sinus Cyst
|Aliases            =  
|synonyms = Nasal dermoid, Nasal dermoid cyst, Congenital midline nasal dermoid
|Image              =  
|image = [[File:Nasal_dermoid_presentation.jpg|250px]]
|Caption            =  
|caption = Nasal dermoid presenting as midline nasal mass with visible punctum
|ICD-9              =  
|field = [[Pediatric Otolaryngology]], [[Rhinology]], [[Neurosurgery]]
|ICD-10             =  
|symptoms = Midline nasal mass, pit/punctum on nasal dorsum, hair protruding from pit (pathognomonic), recurrent infection
|MeSH              =  
|onset = Congenital (present at birth)
|Gene              =  
|duration = Persistent until surgical excision
|Locus              =  
|types = Type I (subcutaneous), Type II (intraosseous), Type III (epidural), Type IV (intradural)
|OMIM              =  
|causes = Incomplete separation of neuroectoderm from surface ectoderm during embryogenesis
|EyeWiki            =  
|risks = Intracranial extension (10-20%), meningitis risk
|Radiopaedia       =  
|diagnosis = MRI (essential), CT for bony anatomy, clinical examination
|Pathology         =  
|differential = [[Nasal glioma]], [[Encephalocele]], Epidermoid cyst, Hemangioma
|prevention =
|treatment = Complete surgical excision (essential)
|prognosis = Excellent with complete excision (>95% cure rate); recurrence <5-10% in contemporary series
|frequency = ~1 in 50,000 live births (most common congenital midline nasal lesion at 61%)
|deaths =
|ICD10 = Q30.8
|ICD9 = 748.1
|MeSH =
|Orphanet = 141103
|Radiopaedia = https://radiopaedia.org/articles/nasal-dermoid-cyst
|Pathology = https://www.pathologyoutlines.com/topic/skintumornonmelanocyticdermoidcyst.html
}}
}}


== Overview ==
== Overview ==
'''Nasal dermoids''' are rare congenital midline nasal masses that form as a result of aberrant migration of mesodermal and ectodermal cells during formation of nasal structures.


=== History ===
'''Nasal dermoid''' (nasal dermoid sinus cyst, NDSC) is a benign congenital midline nasal mass resulting from incomplete separation of neuroectoderm from surface ectoderm during embryonic development.<ref name="StatPearls2024">Dermoid Cyst. StatPearls Publishing. 2024.</ref> It is the '''most common congenital midline nasal lesion''', accounting for 61% of such masses, followed by nasal glioma (30%) and encephalocele (9%).<ref name="Rahbar2003">Rahbar R, Resto VA, Robson CD, et al. Nasal glioma and encephalocele: diagnosis and management. ''Laryngoscope''. 2003;113(12):2069-2077.</ref>
 
Nasal dermoids occur in approximately '''1 in 20,000 to 40,000 live births''' with a slight male predominance.<ref name="Frontiers2025">Pediatric nasal dermoid sinus cysts: advances in pathogenesis, management strategies, and translational research—a multidisciplinary management perspective. ''Frontiers in Pediatrics''. 2025.</ref> The lesion may present as a subcutaneous cyst, a sinus tract with a visible punctum on the nasal dorsum, or both. Critically, '''10-45% of nasal dermoids have intracranial extension''',<ref name="StatPearls2024" /> making preoperative imaging essential to surgical planning. Complications include recurrent infection and, in cases with intracranial connection, meningitis and brain abscess.<ref name="Wardinsky1991">Wardinsky TD, Pagon RA, Kropp RJ, et al. Nasal dermoid sinus cysts: association with intracranial extension and multiple malformations. ''Cleft Palate Craniofac J''. 1991;28(1):87-95.</ref>
 
== History ==
 
Nasal dermoids have been recognized since antiquity, with detailed descriptions appearing throughout medical literature.<ref name="Hedlund2006">Hedlund G. Congenital frontonasal masses: developmental anatomy, malformations, and MR imaging. ''Pediatr Radiol''. 2006;36(7):647-662.</ref> In 1910, Sessions described the potential for intracranial extension of nasal dermoids through the foramen cecum. Bradley and Singh provided a comprehensive classification of nasal dermoid presentations in 1982.
 
Understanding the embryologic relationship between nasal dermoid, nasal glioma, and encephalocele as variants of the same developmental abnormality helped unify management principles.<ref name="DiffDiag2024">The Differential Diagnosis of Congenital Developmental Midline Nasal Masses: Histopathological, Clinical, and Radiological Aspects. ''Diagnostics''. 2024;13(17):2796.</ref> The development of MRI in the 1980s revolutionized preoperative assessment by allowing reliable identification of intracranial extension, guiding surgical planning.<ref name="Hedlund2006" />


== Pathophysiology ==
== Pathophysiology ==
=== Relevant Anatomy ===
=== Relevant Anatomy ===
'''Embryologic development''':
The pathogenesis relates to closure of the anterior neuropore:<ref name="StatPearls2024" />
* At 3-4 weeks of gestation, the anterior neuropore closes
* A dural projection (prenasal space) temporarily extends through the developing frontal bones between the nasal bones and cartilaginous nasal capsule
* This dural diverticulum normally retracts by the 8th week
* The fonticulus frontalis (future foramen cecum) then closes
'''Pathogenesis of nasal dermoid''':
* During retraction, surface ectoderm may become entrapped along the pathway of the dural projection
* The entrapped ectoderm forms a dermoid cyst or sinus tract
* A fibrous stalk may persist connecting the dermoid to the intracranial space
'''Key anatomical landmarks''':
* '''Foramen cecum''': Bony opening at cribriform plate; may be enlarged if intracranial connection present
* '''Crista galli''': Dermoid tract may extend to or around this structure
* '''Anterior cranial fossa''': Site of intracranial extension
'''Classification by location''':
* External (subcutaneous): Most common presentation
* Intranasal: Within nasal cavity
* Intracranial: Extension through skull base (10-45% of cases)<ref name="StatPearls2024" />
=== Disease Etiology ===
=== Disease Etiology ===
=== Genetics ===
 
=== Histology ===
'''Histopathology''':
=== Epidemiology ===
* Epithelium-lined cyst (stratified squamous epithelium)
Nasal dermoids make up approximately 10% of head and neck dermoids, and approximately 1% of all dermoids.<ref>McCaffrey TV, McDonald TJ, Gorenstein A. Dermoid cysts of the nose: review of 21 cases. Otolaryngology–Head and Neck Surgery. 1979 Jan;87(1):52-9.</ref>
* Dermal appendages within wall:<ref name="StatPearls2024" />
** Hair follicles ('''pathognomonic when protruding from pit''')
** Sebaceous glands
** Sweat glands
* Keratinous debris within cyst
* May show inflammatory changes if infected
 
'''Distinguishing from related lesions''':
 
The '''Furstenberg test''' (compression of jugular vein or straining) is key to differentiation:<ref name="DiffDiag2024" />
* '''Nasal dermoid''': Non-compressible, does not transilluminate, '''negative Furstenberg test'''
* '''Encephalocele''': Enlarges with crying/Valsalva, transilluminates, '''positive Furstenberg test'''
* '''Nasal glioma''': Non-compressible, does not transilluminate, negative Furstenberg test, but may have stalk connection
 
{| class="wikitable"
|-
! Lesion !! Contents !! Intracranial connection !! Transillumination !! Furstenberg Test
|-
| Nasal dermoid || Ectodermal derivatives (hair, skin appendages) || 10-45% (fibrous stalk) || Negative || Negative
|-
| Nasal glioma || Glial tissue (astrocytes) || 15-20% (fibrous stalk, no CSF) || Negative || Negative
|-
| Encephalocele || Brain/meninges with CSF || Always (patent) || Positive || Positive
|}


== Diagnosis ==
== Diagnosis ==
=== Patient History ===
=== Patient History ===
Nasal dermoids are congenital lesions, and should be identifiable from birth. Small dermoids may go unnoticed for some time. Important considerations include any other history of congenital malformations, known genetic syndromes, and history of nasal obstruction.
 
'''Clinical presentation''':
* '''Age''': Usually present at birth or early infancy; 60% diagnosed by age 5<ref name="StatPearls2024" />
* '''Pit or punctum''': Visible opening on nasal dorsum (pathognomonic when present)
* '''Hair protruding from pit''': '''Pathognomonic for dermoid cyst'''<ref name="StatPearls2024" />
* '''Subcutaneous mass''': Firm, non-compressible, midline or paramedian
* '''Recurrent infections''': Cellulitis, abscess from infected cyst
* '''Intermittent sebaceous discharge''': May be observed from skin ostium<ref name="StatPearls2024" />
 
'''Location of dermoid''':
* Glabella and nasal root (most common)
* Nasal dorsum
* Columella
* Nasal tip
 
'''Key clinical features''':
* Does not transilluminate
* Does not increase with crying or Valsalva (negative Furstenberg test distinguishes from encephalocele)<ref name="DiffDiag2024" />
* May enlarge slowly over time (accumulated debris)
* Hypertelorism and broadened nasal bridge may be present in larger lesions (approximately 50% of cases)<ref name="StatPearls2024" />


=== Physical Examination ===
=== Physical Examination ===
'''External examination''':
* Firm, non-tender, non-compressible midline nasal mass<ref name="DiffDiag2024" />
* Skin dimple, pit, or punctum (present in approximately 50%)<ref name="StatPearls2024" />
* Hair protruding from pit (when present, '''highly specific''')<ref name="StatPearls2024" />
* Mass does not transilluminate
* '''Negative Furstenberg test''' (no enlargement with crying or straining)<ref name="DiffDiag2024" />
* Telecanthus, broadening of nasal dorsum (large lesions)
'''Nasal endoscopy''':
* May see intranasal component
* Usually near septum
* Important for surgical planning
'''Warning signs of intracranial extension''':
* History of meningitis
* Very superior location at glabella
* Large lesion size
=== Laboratory Tests ===
=== Laboratory Tests ===
Laboratory tests are generally not needed for diagnosis.<ref name="StatPearls2024" />
* '''CSF analysis''': If meningitis suspected
* '''Beta-2 transferrin''': If CSF leak suspected (rare in dermoid cysts)
=== Imaging ===
=== Imaging ===
'''MRI''' ('''imaging modality of choice'''):<ref name="Hedlund2006">Hedlund G. Congenital frontonasal masses: developmental anatomy, malformations, and MR imaging. ''Pediatr Radiol''. 2006;36(7):647-662.</ref>
* '''Essential''' to evaluate for intracranial extension<ref name="StatPearls2024" />
* Superior soft tissue characterization and identification of intracranial extension<ref name="RadiopaediaMRI">Nasal dermoid cyst. Radiopaedia. 2025.</ref>
* Findings:
** Well-defined midline cystic mass
** T1-weighted: Variable signal (depends on contents)
** T2-weighted: Typically hyperintense
** Fat-containing components may be present
** Tract extending to foramen cecum/crista galli (if intracranial extension)
** Dural enhancement if inflamed
'''High-resolution CT''':
* Evaluates bony anatomy and skull base involvement<ref name="StatPearls2024" />
* Findings:
** Nasal bone defect
** Enlarged foramen cecum (suggests intracranial connection)
** Bifid crista galli (associated finding)
** Widened nasal bones
'''Key imaging findings suggesting intracranial extension''':
* Foramen cecum >4 mm
* Bifid crista galli
* Visible tract extending through skull base<ref name="RadiopaediaMRI" />
* MRI has higher predictive value than CT for detecting intracranial extension<ref name="RadiopaediaMRI" />
=== Differential Diagnosis ===
=== Differential Diagnosis ===
Other midline congenital nasal masses should be considered:
 
* [[Glioma]]
The '''three main congenital midline nasal masses''' are:
* [[Encephalocele]]
* '''Nasal dermoid''' (61% of midline masses)<ref name="Rahbar2003" /> - ectodermal derivatives, negative Furstenberg test
* '''Nasal glioma''' (30% of midline masses)<ref name="Rahbar2003" /> - ectopic glial tissue, negative Furstenberg test, 15-20% intracranial connection<ref name="DiffDiag2024" />
* '''Encephalocele''' (9% of midline masses)<ref name="Rahbar2003" /> - brain/meninges with CSF, positive Furstenberg test, transilluminates
 
Other differential considerations:
* Dacryocystocele (lateral location at medial canthus)
* Hemangioma (soft, compressible, bluish, transilluminates)
* Epidermoid cyst (no dermal appendages)
* Lipoma
* Frontonasal meningocele/meningoencephalocele


== Management ==
== Management ==
=== Medical Management ===
=== Medical Management ===
There is no effective medical management for nasal dermoid. '''Surgical excision is the definitive treatment'''.<ref name="StatPearls2024" />
'''Preoperative considerations''':
* Treatment of acute infection before definitive surgery
* Antibiotics for infected dermoid/abscess<ref name="StatPearls2024" />
* Incision and drainage if abscess present (definitive surgery delayed)
* '''Multidisciplinary approach''' (otolaryngology and neurosurgery) recommended for lesions with suspected/confirmed intracranial extension<ref name="Frontiers2025" />
* Preoperative imaging (MRI ± CT) essential for surgical planning<ref name="Hedlund2006" />
=== Surgical Management ===
=== Surgical Management ===
'''Surgical excision is the treatment of choice''':<ref name="Wardinsky1991" />
'''Goals of surgery''':
* '''Complete excision''' of cyst and tract (essential to prevent recurrence)<ref name="StatPearls2024" />
* Removal of any intracranial extension
* Acceptable cosmetic outcome
* Prevention of recurrence
'''Surgical approaches''' (depend on extent of lesion):<ref name="StatPearls2024" />
'''Vertical midline incision''':
* For small, external lesions with no intracranial extension
* Direct access to cyst
* May require elliptical excision around punctum
'''External rhinoplasty approach''':
* Better visualization for larger lesions
* Allows dissection along nasal dorsum
* Good cosmetic result<ref name="StatPearls2024" />
'''Open rhinoplasty with bicoronal flap''':
* For lesions with suspected/confirmed intracranial extension
* Allows craniofacial exposure
* Combined with neurosurgical approach if needed
'''Endoscopic transnasal approach''':
* For intranasal component
* May be combined with external approach
'''Craniotomy''':
* Required for lesions with proven intracranial extension
* Bifrontal craniotomy or '''small window craniotomy''' allows exposure of anterior cranial fossa<ref name="StatPearls2024" />
* Tract followed and excised to dural attachment
* Dural defect repaired to prevent CSF leak
'''Surgical principles''':
* '''Complete excision essential''' to prevent recurrence (failure to completely excise results in 10-40% recurrence rates)<ref name="StatPearls2024" />
* Trace any tract to its termination
* If tract enters skull base, craniotomy warranted
* Skull base reconstruction if defect created
* Meticulous hemostasis
* Consider placing drain to prevent hematoma


== Outcomes ==
== Outcomes ==
=== Complications ===
=== Complications ===
'''Untreated nasal dermoid''':
* '''Recurrent infection''' (cellulitis, abscess)<ref name="StatPearls2024" />
* '''Meningitis''' (if intracranial connection)<ref name="StatPearls2024" />
* Brain abscess
* Progressive enlargement with cosmetic deformity
* Nasal obstruction
* Osteomyelitis (with intracranial involvement)<ref name="StatPearls2024" />
'''Surgical complications''':
* '''Recurrence''': 10-40% if incompletely excised<ref name="StatPearls2024" />
* CSF leak (if intracranial extension)
* '''Meningitis''': Risk if intracranial connection not completely removed<ref name="StatPearls2024" />
* Scarring/cosmetic deformity
* Nasal deformity (if extensive dissection)
* Bleeding
* Infection
=== Prognosis ===
=== Prognosis ===
'''Excellent outcomes with complete surgical excision''':
* '''Cure rate >95%''' with complete excision<ref name="StatPearls2024" />
* Recurrence typically due to incomplete initial removal
* Cosmetic outcomes generally good, especially with appropriate approach selection
* No malignant potential
* Low recurrence rates (0-5%) with adequate surgical technique and multidisciplinary approach<ref name="Frontiers2025" />
'''Factors affecting outcome''':
* '''Complete excision is the most important prognostic factor'''<ref name="StatPearls2024" />
* Intracranial extension increases surgical complexity
* Prior infection/surgery may complicate dissection and increase recurrence risk
'''Follow-up''':
* Clinical examination for signs of recurrence
* Imaging if recurrence suspected (recurrence typically presents within 2-5 years post-op)
* Long-term prognosis excellent after complete excision


== References ==
== References ==
<references />
 
<references>
<ref name="StatPearls2024">Dermoid Cyst. StatPearls Publishing. 2024. Available from: https://www.ncbi.nlm.nih.gov/books/NBK560573/</ref>
 
<ref name="Rahbar2003">Rahbar R, Resto VA, Robson CD, et al. Nasal glioma and encephalocele: diagnosis and management. ''Laryngoscope''. 2003;113(12):2069-2077.</ref>
 
<ref name="Wardinsky1991">Wardinsky TD, Pagon RA, Kropp RJ, et al. Nasal dermoid sinus cysts: association with intracranial extension and multiple malformations. ''Cleft Palate Craniofac J''. 1991;28(1):87-95.</ref>
 
<ref name="Hedlund2006">Hedlund G. Congenital frontonasal masses: developmental anatomy, malformations, and MR imaging. ''Pediatr Radiol''. 2006;36(7):647-662.</ref>
 
<ref name="Frontiers2025">Pediatric nasal dermoid sinus cysts: advances in pathogenesis, management strategies, and translational research—a multidisciplinary management perspective. ''Frontiers in Pediatrics''. 2025. Available from: https://www.frontiersin.org/journals/pediatrics/articles/10.3389/fped.2025.1708853/full</ref>
 
<ref name="DiffDiag2024">The Differential Diagnosis of Congenital Developmental Midline Nasal Masses: Histopathological, Clinical, and Radiological Aspects. ''Diagnostics''. 2024;13(17):2796. Available from: https://www.mdpi.com/2075-4418/13/17/2796</ref>
 
<ref name="RadiopaediaMRI">Nasal dermoid cyst. Radiopaedia.org. 2025. Available from: https://radiopaedia.org/articles/nasal-dermoid-cyst?lang=us</ref>
</references>
 
[[Category:Rhinology]]
[[Category:Congenital disorders]]
[[Category:Pediatric Otolaryngology]]

Latest revision as of 00:59, 3 February 2026


Overview

Nasal dermoid (nasal dermoid sinus cyst, NDSC) is a benign congenital midline nasal mass resulting from incomplete separation of neuroectoderm from surface ectoderm during embryonic development.[1] It is the most common congenital midline nasal lesion, accounting for 61% of such masses, followed by nasal glioma (30%) and encephalocele (9%).[2]

Nasal dermoids occur in approximately 1 in 20,000 to 40,000 live births with a slight male predominance.[3] The lesion may present as a subcutaneous cyst, a sinus tract with a visible punctum on the nasal dorsum, or both. Critically, 10-45% of nasal dermoids have intracranial extension,[1] making preoperative imaging essential to surgical planning. Complications include recurrent infection and, in cases with intracranial connection, meningitis and brain abscess.[4]

History

Nasal dermoids have been recognized since antiquity, with detailed descriptions appearing throughout medical literature.[5] In 1910, Sessions described the potential for intracranial extension of nasal dermoids through the foramen cecum. Bradley and Singh provided a comprehensive classification of nasal dermoid presentations in 1982.

Understanding the embryologic relationship between nasal dermoid, nasal glioma, and encephalocele as variants of the same developmental abnormality helped unify management principles.[6] The development of MRI in the 1980s revolutionized preoperative assessment by allowing reliable identification of intracranial extension, guiding surgical planning.[5]

Pathophysiology

Relevant Anatomy

Embryologic development:

The pathogenesis relates to closure of the anterior neuropore:[1]

  • At 3-4 weeks of gestation, the anterior neuropore closes
  • A dural projection (prenasal space) temporarily extends through the developing frontal bones between the nasal bones and cartilaginous nasal capsule
  • This dural diverticulum normally retracts by the 8th week
  • The fonticulus frontalis (future foramen cecum) then closes

Pathogenesis of nasal dermoid:

  • During retraction, surface ectoderm may become entrapped along the pathway of the dural projection
  • The entrapped ectoderm forms a dermoid cyst or sinus tract
  • A fibrous stalk may persist connecting the dermoid to the intracranial space

Key anatomical landmarks:

  • Foramen cecum: Bony opening at cribriform plate; may be enlarged if intracranial connection present
  • Crista galli: Dermoid tract may extend to or around this structure
  • Anterior cranial fossa: Site of intracranial extension

Classification by location:

  • External (subcutaneous): Most common presentation
  • Intranasal: Within nasal cavity
  • Intracranial: Extension through skull base (10-45% of cases)[1]

Disease Etiology

Histopathology:

  • Epithelium-lined cyst (stratified squamous epithelium)
  • Dermal appendages within wall:[1]
    • Hair follicles (pathognomonic when protruding from pit)
    • Sebaceous glands
    • Sweat glands
  • Keratinous debris within cyst
  • May show inflammatory changes if infected

Distinguishing from related lesions:

The Furstenberg test (compression of jugular vein or straining) is key to differentiation:[6]

  • Nasal dermoid: Non-compressible, does not transilluminate, negative Furstenberg test
  • Encephalocele: Enlarges with crying/Valsalva, transilluminates, positive Furstenberg test
  • Nasal glioma: Non-compressible, does not transilluminate, negative Furstenberg test, but may have stalk connection
Lesion Contents Intracranial connection Transillumination Furstenberg Test
Nasal dermoid Ectodermal derivatives (hair, skin appendages) 10-45% (fibrous stalk) Negative Negative
Nasal glioma Glial tissue (astrocytes) 15-20% (fibrous stalk, no CSF) Negative Negative
Encephalocele Brain/meninges with CSF Always (patent) Positive Positive

Diagnosis

Patient History

Clinical presentation:

  • Age: Usually present at birth or early infancy; 60% diagnosed by age 5[1]
  • Pit or punctum: Visible opening on nasal dorsum (pathognomonic when present)
  • Hair protruding from pit: Pathognomonic for dermoid cyst[1]
  • Subcutaneous mass: Firm, non-compressible, midline or paramedian
  • Recurrent infections: Cellulitis, abscess from infected cyst
  • Intermittent sebaceous discharge: May be observed from skin ostium[1]

Location of dermoid:

  • Glabella and nasal root (most common)
  • Nasal dorsum
  • Columella
  • Nasal tip

Key clinical features:

  • Does not transilluminate
  • Does not increase with crying or Valsalva (negative Furstenberg test distinguishes from encephalocele)[6]
  • May enlarge slowly over time (accumulated debris)
  • Hypertelorism and broadened nasal bridge may be present in larger lesions (approximately 50% of cases)[1]

Physical Examination

External examination:

  • Firm, non-tender, non-compressible midline nasal mass[6]
  • Skin dimple, pit, or punctum (present in approximately 50%)[1]
  • Hair protruding from pit (when present, highly specific)[1]
  • Mass does not transilluminate
  • Negative Furstenberg test (no enlargement with crying or straining)[6]
  • Telecanthus, broadening of nasal dorsum (large lesions)

Nasal endoscopy:

  • May see intranasal component
  • Usually near septum
  • Important for surgical planning

Warning signs of intracranial extension:

  • History of meningitis
  • Very superior location at glabella
  • Large lesion size

Laboratory Tests

Laboratory tests are generally not needed for diagnosis.[1]

  • CSF analysis: If meningitis suspected
  • Beta-2 transferrin: If CSF leak suspected (rare in dermoid cysts)

Imaging

MRI (imaging modality of choice):[5]

  • Essential to evaluate for intracranial extension[1]
  • Superior soft tissue characterization and identification of intracranial extension[7]
  • Findings:
    • Well-defined midline cystic mass
    • T1-weighted: Variable signal (depends on contents)
    • T2-weighted: Typically hyperintense
    • Fat-containing components may be present
    • Tract extending to foramen cecum/crista galli (if intracranial extension)
    • Dural enhancement if inflamed

High-resolution CT:

  • Evaluates bony anatomy and skull base involvement[1]
  • Findings:
    • Nasal bone defect
    • Enlarged foramen cecum (suggests intracranial connection)
    • Bifid crista galli (associated finding)
    • Widened nasal bones

Key imaging findings suggesting intracranial extension:

  • Foramen cecum >4 mm
  • Bifid crista galli
  • Visible tract extending through skull base[7]
  • MRI has higher predictive value than CT for detecting intracranial extension[7]

Differential Diagnosis

The three main congenital midline nasal masses are:

  • Nasal dermoid (61% of midline masses)[2] - ectodermal derivatives, negative Furstenberg test
  • Nasal glioma (30% of midline masses)[2] - ectopic glial tissue, negative Furstenberg test, 15-20% intracranial connection[6]
  • Encephalocele (9% of midline masses)[2] - brain/meninges with CSF, positive Furstenberg test, transilluminates

Other differential considerations:

  • Dacryocystocele (lateral location at medial canthus)
  • Hemangioma (soft, compressible, bluish, transilluminates)
  • Epidermoid cyst (no dermal appendages)
  • Lipoma
  • Frontonasal meningocele/meningoencephalocele

Management

Medical Management

There is no effective medical management for nasal dermoid. Surgical excision is the definitive treatment.[1]

Preoperative considerations:

  • Treatment of acute infection before definitive surgery
  • Antibiotics for infected dermoid/abscess[1]
  • Incision and drainage if abscess present (definitive surgery delayed)
  • Multidisciplinary approach (otolaryngology and neurosurgery) recommended for lesions with suspected/confirmed intracranial extension[3]
  • Preoperative imaging (MRI ± CT) essential for surgical planning[5]

Surgical Management

Surgical excision is the treatment of choice:[4]

Goals of surgery:

  • Complete excision of cyst and tract (essential to prevent recurrence)[1]
  • Removal of any intracranial extension
  • Acceptable cosmetic outcome
  • Prevention of recurrence

Surgical approaches (depend on extent of lesion):[1]

Vertical midline incision:

  • For small, external lesions with no intracranial extension
  • Direct access to cyst
  • May require elliptical excision around punctum

External rhinoplasty approach:

  • Better visualization for larger lesions
  • Allows dissection along nasal dorsum
  • Good cosmetic result[1]

Open rhinoplasty with bicoronal flap:

  • For lesions with suspected/confirmed intracranial extension
  • Allows craniofacial exposure
  • Combined with neurosurgical approach if needed

Endoscopic transnasal approach:

  • For intranasal component
  • May be combined with external approach

Craniotomy:

  • Required for lesions with proven intracranial extension
  • Bifrontal craniotomy or small window craniotomy allows exposure of anterior cranial fossa[1]
  • Tract followed and excised to dural attachment
  • Dural defect repaired to prevent CSF leak

Surgical principles:

  • Complete excision essential to prevent recurrence (failure to completely excise results in 10-40% recurrence rates)[1]
  • Trace any tract to its termination
  • If tract enters skull base, craniotomy warranted
  • Skull base reconstruction if defect created
  • Meticulous hemostasis
  • Consider placing drain to prevent hematoma

Outcomes

Complications

Untreated nasal dermoid:

  • Recurrent infection (cellulitis, abscess)[1]
  • Meningitis (if intracranial connection)[1]
  • Brain abscess
  • Progressive enlargement with cosmetic deformity
  • Nasal obstruction
  • Osteomyelitis (with intracranial involvement)[1]

Surgical complications:

  • Recurrence: 10-40% if incompletely excised[1]
  • CSF leak (if intracranial extension)
  • Meningitis: Risk if intracranial connection not completely removed[1]
  • Scarring/cosmetic deformity
  • Nasal deformity (if extensive dissection)
  • Bleeding
  • Infection

Prognosis

Excellent outcomes with complete surgical excision:

  • Cure rate >95% with complete excision[1]
  • Recurrence typically due to incomplete initial removal
  • Cosmetic outcomes generally good, especially with appropriate approach selection
  • No malignant potential
  • Low recurrence rates (0-5%) with adequate surgical technique and multidisciplinary approach[3]

Factors affecting outcome:

  • Complete excision is the most important prognostic factor[1]
  • Intracranial extension increases surgical complexity
  • Prior infection/surgery may complicate dissection and increase recurrence risk

Follow-up:

  • Clinical examination for signs of recurrence
  • Imaging if recurrence suspected (recurrence typically presents within 2-5 years post-op)
  • Long-term prognosis excellent after complete excision

References

  1. ↑ 1.00 1.01 1.02 1.03 1.04 1.05 1.06 1.07 1.08 1.09 1.10 1.11 1.12 1.13 1.14 1.15 1.16 1.17 1.18 1.19 1.20 1.21 1.22 1.23 1.24 1.25 1.26 1.27 Dermoid Cyst. StatPearls Publishing. 2024. Cite error: Invalid <ref> tag; name "StatPearls2024" defined multiple times with different content
  2. ↑ 2.0 2.1 2.2 2.3 Rahbar R, Resto VA, Robson CD, et al. Nasal glioma and encephalocele: diagnosis and management. Laryngoscope. 2003;113(12):2069-2077.
  3. ↑ 3.0 3.1 3.2 Pediatric nasal dermoid sinus cysts: advances in pathogenesis, management strategies, and translational research—a multidisciplinary management perspective. Frontiers in Pediatrics. 2025. Cite error: Invalid <ref> tag; name "Frontiers2025" defined multiple times with different content
  4. ↑ 4.0 4.1 Wardinsky TD, Pagon RA, Kropp RJ, et al. Nasal dermoid sinus cysts: association with intracranial extension and multiple malformations. Cleft Palate Craniofac J. 1991;28(1):87-95.
  5. ↑ 5.0 5.1 5.2 5.3 Hedlund G. Congenital frontonasal masses: developmental anatomy, malformations, and MR imaging. Pediatr Radiol. 2006;36(7):647-662.
  6. ↑ 6.0 6.1 6.2 6.3 6.4 6.5 The Differential Diagnosis of Congenital Developmental Midline Nasal Masses: Histopathological, Clinical, and Radiological Aspects. Diagnostics. 2024;13(17):2796. Cite error: Invalid <ref> tag; name "DiffDiag2024" defined multiple times with different content
  7. ↑ 7.0 7.1 7.2 Nasal dermoid cyst. Radiopaedia. 2025. Cite error: Invalid <ref> tag; name "RadiopaediaMRI" defined multiple times with different content
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