Memory loss and personality changes.
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T2 hyperintense and mixed T1 hyperintense extradural lesion measuring 4.7 cm in the right posterior fossa that demonstrates high DWI signal with areas of true diffusion restriction.
The patient proceeded to craniotomy and resection of the mass.
MACROSCOPIC DESCRIPTION: An aggregate of tan yellow/light pink soft tissue 11x8x6mm.
MICROSCOPIC DESCRIPTION: Sections show a cyst wall lining with a thin layer of stratified squamous epithelium including a granular cell layer, with bland nuclear features and surface keratinization. The wall is fibrous with areas of infiltration by mononuclear chronic inflammatory cells with foreign body type multinucleate giant cells, in association with cholesterol clefts. There is no brain tissue identified. There is no evidence of malignancy.
DIAGNOSIS: Epidermal cyst.