ANEURYSMAL SUBARACHNOID HEMORRHAGE IN A PATIENT WITH BILATERAL A(1) FENESTRATIONS ASSOCIATED WITH AN AZYGOS ANTERIOR CEREBRAL-ARTERY - CASE-REPORT AND LITERATURE-REVIEW

Fenestration of the proximal anterior cerebral artery (A(1) segment) i s a rare occurrence. This vascular anomaly is often associated with an eurysms and other abnormalities. The current article describes the cas e of a 33-year-old man who presented with a subarachnoid hemorrhage se condary to a ruptured aneurysm originating from the proximal end of an A, fenestration. This patient also had a contralateral A, fenestratio n as well as an azygos anterior cerebral artery. This is the first rep ort of such an unusual vascular anatomy. The literature is reviewed an d possible embryological mechanisms are discussed.