Carotid angiography of arteriovenous malformations during operation

The value of carotid angiography during operation in the surgical treatment of arteriovenous malformation is illustrated by 4 patients. After obliteration of the main supply to the malformation the blood may be redistributed to possible smaller feeding vessels now dilated and more clearly demonstrable than preoperatively. In some cases, angiography both preoperatively and during operation may be needed for a demonstration of the whole malformation with all its feeding vessels. Angiography during operation reduces the need for postoperative angiography.