RT Journal Article SR Electronic T1 Anomalous Origin of the Callosomarginal Artery from the A1 Segment with an Associated Saccular Aneurysm JF American Journal of Neuroradiology JO Am. J. Neuroradiol. FD American Society of Neuroradiology SP 2075 OP 2077 VO 27 IS 10 A1 T. Krishnamoorthy A1 A.K. Gupta A1 R.N. Bhattacharya A1 B.J. Rajesh A1 S. Purkayastha YR 2006 UL http://www.ajnr.org/content/27/10/2075.abstract AB SUMMARY: Although anatomic variations are well known in the A1 segment of the anterior cerebral artery (ACA), anomalous origin of a cortical artery from the A1 segment is extremely rare. The only reported cortical branch to arise from the A1 segment is the fronto-orbital artery. We report a case of anomalous origin of the callosomarginal artery (CMA) in association with a saccular aneurysm from the A1 segment of the left ACA in a 35-year-old man who presented with intracerebral hemorrhage. To our knowledge, this is the first report of anomalous origin of the CMA from the A1 segment.