Identification of a brain stone as calcified hemangioma: case report.

A 71-year-old woman with progressive hemiparesis had a large cerebral calculus (brain stone) removed from the temporal lobe. Her condition thereafter improved remarkably. The differential diagnosis and specific methods to determine the angiomatous nature of this almost acellular mass are discussed. Reticulin impregnation, elastic tissue stain, and electron microscopy were of greatest value.