Metastatic prostate adenocarcinoma of the dura mater.

A 70-year-old man with known metastatic prostate carcinoma to the long bones of the lower extremities, presented with a several day history of lethargy and confusion. CT was interpreted as showing bilateral acute and chronic subdural hematomas (SDH). Upon opening the dura, a yellowish, firm tumor was layered over the frontal convexity. No hematoma was found. Histological examination revealed prostate carcinoma.