Abstract
Epidermoid cysts are benign, uncommon lesions accounting for less than 1% of all intracranial tumors. Their location is intradiploic in 25% of cases, and rarely subtentorial. We report here a rare case of giant subtentorial intradiploic epidermoid cyst in a thirty year old patient who presented with subcutaneous retromastoid swelling. Computerized Tomography (CT) scan and Magnetic Resonance (MR) imaging revealed a giant osteolytic extradural lesion of the posterior fossa. Retrosigmoid suboccpital craniectomy and total removal of the tumor was done. Histopathological examination confirmed an epidermoid cyst. The outcome was good.
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