Abstract
Epidermoid tumors of the central nervous system are typically found in the cerebellopontine angle or parasellar space and comprise approximately 1% of all intracranial tumors. Dermoid cysts tend to occur in midline locations. Both are derived from embryonal tissue and have classic imaging findings on computed tomography and magnetic resonance imaging. Epidermoid tumors and dermoid cysts are benign and grow slowly, although epidermoid cysts can undergo malignant transformation. Surgical decisions and approaches are based on the presenting symptoms and anatomic location of the tumor. Mollaret meningitis is a unique complication of these cysts and may occur if the cyst ruptures preoperatively or during surgery.