Brain Tumor Res Treat.  2014 Apr;2(1):39-42. 10.14791/btrt.2014.2.1.39.

Extradural Dermoid Cyst Located in the Lateral Sphenoid Ridge

• Ko SJ
• Park KJ
• Park DH
• Kang SH

• KMID: 1734667
• DOI: http://doi.org/10.14791/btrt.2014.2.1.39

Abstract

Dermoid cysts are rare congenital tumors that occur primarily at the midline at a characteristic intradural location. However, dermoid cysts located at extradural and lateral regions have been rarely reported until now. In the present study, the authors demonstrate the unusual instance of an intracranial extradural dermoid cyst at the lateral sphenoid ridge. A 53-year-old woman admitted because of progressive headache and dizziness. The patient had no neurologic deficits, and magnetic resonance imaging with no contrast enhancement revealed a mass at the right sphenoid ridge. The mass was accompanied with sphenoid bone erosion visible on computed tomography. The patient underwent right pterional craniotomy, and the tumor including the capsule was totally resected. Presence of a dermoid cyst was confirmed with histopathological examination. The patient had no complications during the postoperative period. This study suggests that dermoid cyst should be considered for differential diagnosis of extradural and lateral intracranial masses.

Keyword

Dermoid cyst; Extradura; Bone erosion; Brain mass

MeSH Terms

Craniotomy
Dermoid Cyst*
Diagnosis, Differential
Dizziness
Female
Headache
Humans
Magnetic Resonance Imaging
Middle Aged
Neurologic Manifestations
Postoperative Period
Sphenoid Bone

Figure

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  Fig. 1 Computed tomography: soft tissue window (A) and bone window (B) demonstrating a hypodense lesion with bone erosion at right sphenoid ridge, but not communicating with scalp.

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  Fig. 2 Magnetic resonance imaging showing an expansile and multilobulated extraaxial mass on right lateral sphenoid ridge with high signal intensity on T1-weighted (A), low to iso signal intensity on T2-weighted (B) and no enhancement on contrast enhancing T1-weighted sequence (C). There was not a cerebrospinal fluid space widening around the mass.

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  Fig. 3 Intraoperative findings: dermoid contents including capsule at epidural space of right sphenoid ridge (A). Totally resected mass including capsule and intact dura (B).

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  Fig. 4 Photomicrographs of a portion of cyst wall (A) and contents (B) demonstrating stratified squamous epithelium (arrow) and keratinous materials (arrowhead) (H&E, original magnification ×400).

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