Extensive subdural mass

An unusual case of a 62-year-old man with focal seizures, tinnitus, and pro gressive left hemiparesis due to an extensive subdural plasma cell granulom a is presented. Five-year clinical and radiologic follow-up demonstrating t he chronic yet progressive nature of this granuloma is presented. This is t he first report of focal calcification seen in an intracranial plasma cell granuloma. The imaging, neuropathologic, and clinical characteristics of th is rare lesion are reviewed.