Malignant Change in an Intracranial Epidermoid Cyst

Abstract
A malignant epidermoid tumor invading the 4th ventricle had histologic features that indicated malignant transformation in a benign epidermoid cyst. The computed tomographic (CT) findings correlated precisely with the histologic features, revealing both pathologic enhancement and a low attenuation zone. The spectrum of described CT findings in intracranial epidermoids is reviewed and contrasted with the appearance encountered in the present case [53 yr old man].

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