Aneurysms of azygous anterior cerebral artery. Report of two cases treated by surgery.

The occurrence of a so called azygous anomaly of the distal ACA, consisting in a single branch, is rare. Authors report two cases of azygous aneurysm on which surgery was performed successfully, and describe their angiographic characteristics, the frequent association of an aneurysm with azygous and the morphological anomalies of azygous. A literature review is made.