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Postoperative hematomas following 505 operations for intracranial meningiomas.

Five hundred and five operations for intracranial meningiomas were complicated by 18 postoperative hematomas (POH)--3.56%. The POH were more frequently encountered in older patients and/or patients with atherosclerosis, arterial hypertension and diabetes. Longer lasting operations especially cases with intraoperative fall of blood pressure were more often complicated by POH. The POH were more frequently observed following total excision than partial removal and after convexity meningioma operations than other locations. The outcome of the operations complicated by POH was related to the time of their clinical manifestation and removal.