Iwai Toshinori, Izumi Toshiharu, Inoue Tomio, Maegawa Jiro, Fuwa Nobukazu, Mitsudo Kenji, Tohnai Iwai
Department of Oral and Maxillofacial Surgery, Graduate School of Medicine, University of Yokohama City, Kanagawa, Japan.
Iran J Radiol. 2012 Jun;9(2):103-5. doi: 10.5812/iranjradiol.7809. Epub 2012 Jun 30.
Variation of the branches of the external carotid artery (ECA) is well known, but it is extremely rare for the occipital artery (OA) to arise from the internal carotid artery (ICA). A 87-year-old man was found to have this anatomical variation on the right side by threedimensional computed tomography angiography for vascular mapping of the carotid arteries before superselective intra-arterial catheterization for advanced tongue cancer. Imaging showed the OA arose from the anterior aspect of the right ICA with the origin located 8.8 mm distal from the carotid bifurcation. The inner diameter of the origin of the OA was 2.1 mm and the angle between the OA and the ICA was 62 degrees. It is important to recognize this anatomic variation of the branches of the ECA before head and neck microsurgical reconstruction or superselective intra-arterial chemotherapy for oral cancer.
颈外动脉（ECA）分支的变异是众所周知的，但枕动脉（OA）起源于颈内动脉（ICA）极为罕见。一名87岁男性在进行晚期舌癌超选择性动脉内导管插入术前，通过三维计算机断层血管造影术对颈动脉进行血管造影时，发现右侧存在这种解剖变异。影像学显示枕动脉起源于右侧颈内动脉的前侧，起源位于距颈动脉分叉远端8.8毫米处。枕动脉起源处的内径为2.1毫米，枕动脉与颈内动脉之间的夹角为62度。在进行头颈部显微外科重建或口腔癌超选择性动脉内化疗之前，认识到颈外动脉分支的这种解剖变异非常重要。
