Familial Intracranial Aneurysms Associated with Rare Cerebrovascular Anomalies

—Case Reports—

Abstract

Familial occurrence of intracranial aneurysms in two sisters in association with rare cerebrovasculai anomalies is described. The aneurysms were located at the proximal and distal portions of the anterior cerebral arteries in these cases. The azygos anterior cerebral artery in one case and bilateral fenestration, of the vertebral arteries in the other were demonstrated as associated anomalies. These cases support the concept which suggests a hereditary basis for some intracranial aneurysms in addition to the congenita theory of aneurysm formation.