The Coexistence of Accessory Anterior Cerebral and Anterior Communicating Arteries

Variations in the cerebral artery circle are more prevalent than one might expect. This imaging report outlines the variability observed in the anterior circulation of a 47-year-old female patient, analyzed using a computed tomography angiogram. The first segments (A1) of the anterior cerebral arteries (ACAs) on the left and right side emanate from the internal carotid artery. The authors identified 2 anterior communicating arteries (AComAs) standing 1.4 mm apart. The left and right second segments (A2) of the ACAs were typically present, and authors discovered an accessory A2 branching from the second AComA, also referred to as the median artery of the corpus callosum. Consequently, the patient exhibited both accessories ACA and AComA. These morphological variants in the anterior cerebral circulation are particularly significant due to the increased risk of aneurysms in this area.