Practitioners of medicine have long recognized the clinical entity known as "stroke," or "cerebral vascular accident." For many years the cause of the neurologic manifestations has been evident, as either hemorrhage or thrombosis. Similarly, the syndrome of internal carotid artery thrombosis and certain of its sequelae have been recognized. However, it was not until 1937, when Egas Moniz12reported finding 4 cases of thrombosis among his 500 angiograms, that interest was stimulated in this condition and its recognition became more frequent. The increasing recognition of carotid artery thrombosis has paralleled the growth of cerebral arteriography and the establishment of this procedure as a safe and useful diagnostic tool. It is now appreciated that a considerable number of cerebral vascular accidents are the result of thrombotic occlusion of the carotid artery. In view of the potentialities of vascular surgery today, it is clear that physicians must become aware of the