Fulminating parapontine epidermoid carcinoma in a four-year-old boy.

An unique case of primary intracranial epidermoid carcinoma in a 4-year-old boy is described. Its parapontine localization and malignant features combined to produce a fulminating clinical course simulating an intra-axial mass lesion. The probable origin of the carcinoma from a benign epidermoid cyst is discussed. A review of the world's literature establishes not only the rarity of cyst-derived intracranial epidermoid carcinoma, but also its unprecedented occurrence in a child.