Surgical treatment of tentorial arteriovenous malformations draining into the subarachnoid space. Report of four cases.

Four patients with tentorial arteriovenous malformations (AVM's) were treated surgically. The operative findings in the first case suggested that clipping of the draining vein close to the AVM may result in complete cure. The three subsequent cases were treated with this technique. The clinical and radiological implications are discussed.