accessory middle cerebral artery associated with an aneurysm

An accessory middle cerebral artery [MCA] usually originates between the A1 and proximal A2 segment of the anterior cerebral artery, reaches the Sylvian fissure, and supplies the territory of the MCA. This anomaly has been associated with cerebral aneurysms and Moyamoya disease. These associations are rare. We report a case of an accessory MCA associated with an aneurysm. Knowledge and recognition of such anomalies are useful and important in the interpretation of cerebral images and during neurosurgical procedures