RT Journal Article SR Electronic T1 Duplication of the extracranial internal carotid artery. JF American Journal of Neuroradiology JO Am. J. Neuroradiol. FD American Society of Neuroradiology SP 1545 OP 1547 VO 16 IS 7 A1 Chess, M A A1 Barsotti, J B A1 Chang, J K A1 Ketonen, L M A1 Westesson, P L YR 1995 UL http://www.ajnr.org/content/16/7/1545.abstract AB We describe a case of duplication of the left internal carotid artery from a point 1 cm distal to the origin to the proximal petrous segment where the vessel reunites. Duplication and fenestration of the internal carotid artery are discussed. A review of embryologic development is presented. Identification of these entities is important, especially in patients who require surgical intervention involving the internal carotid artery.