Pure Intracavernous Sinus Epidermoid Cyst: Diffusion-Weighted (DW) and Constructive Interference in Steady State (CISS) Images

make up less than 2% of all intracranial space-occupying lesions (1). They are most commonly located in the cerebellopontine angle cistern, which accounts for approximately 40-50% of all intracranial epidermoid cysts, and this is followed by the parasellar region. Epidermoid cysts involving the cavernous sinus are very rare and they can be divided into 3 categories according to their location; extracavernous, interdural and true intracavernous (2). Herein we present the CT and MR imaging features, including the precontrast CT, fluid-attenuated inversion recovery (FLAIR), diffusion-weighted (DW) and constructive interference in steady state (CISS) images, of an unusual case of a true, pathologically proven intracavernous epidermoid cyst.