AGENESIS OF THE INTERNAL CAROTID-ARTERY A SSOCIATED WITH AN ANEURYSM OF THE ANTERIOR COMMUNICATING ARTERY

We report a case of agenesis of the internal carotid artery which was revealed by a subarachnoid hemorrhage. Angiography showed a ruptured a neurysm of the anterior communicating artery and unilateral absence of the left internal carotid artery. Both the left anterior and middle c erebral arteries were perfused from the right carotid artery via the a nterior communicating artery. Absence of the left carotid canal was pr oved on bone CT. Such an association is discussed. An hemodynamic stre ss on a congenital defect of the cerebral arterial wall could be the o rigin of the aneurysm development.