[A combination of a meningioma of the base of the skull and an arteriovenous micromalformation of the brain stem].

The paper describes a rare combination of atypical meningioma of the base of the skull, which was greatly extended, with a life-time unrecognized small vascular malformation of the brain stem at the level of the pons. Intraoperative hemorrhage into the stem from the micromalformation was a cause of the female patient's death. A detailed account of the operation and the postoperative period and a review of literature on the main aspects of the problem in the diagnosis of cerebral micromalformations are given.