DISSECTING ANEURYSMS OF THE ANTERIOR CEREBRAL-ARTERY AND ACCESSORY MIDDLE CEREBRAL-ARTERY - CASE-REPORT

A 66-year-old woman presented with dissecting aneurysms of the anterio r cerebral artery (ACA) and accessory middle cerebral artery (MCA) man ifesting as subarachnoid hemorrhage but without radiological evidence of the dissecting aneurysms. Intraoperative observation revealed that the vessel walls were dark purple in color, a typical finding of disse cting aneurysm. The abnormal A1 segment was trapped and the dissecting aneurysm of the accessory MCA was wrapped. In the case of SAH of unkn own origin, dissecting aneurysm should always be kept in mind even if the angiogram does not show any abnormal finding. This is the first re ported case of dissecting aneurysm of the accessory MCA.