External carotid-vertebral artery anastomosis for vertebrobasilar insufficiency.

Surgical treatment of vertebrobasilar insufficiency has long lagged behind that of carotid disease. However, as more aggressive microsurgical techniques have been developed, surgical intervention in vertebrobasilar occlusive disease is seen with increasing frequency. The authors describe three cases of external carotid vertebral artery anastomosis, a rarely reported operative procedure, in which blood flow was successfully restored to the diseased vertebral artery. Awareness of this new technique will be useful to the radiologist servicing an active neurosurgery practice. The clinical, radiologic, and pathologic manifestations of vertebrobasilar insufficiency are also briefly reviewed.