Department of Diagnostic Radiology, Saitama Medical University International Medical Center, 1397-1 Yamane, Hidaka, Saitama, 350-1298, Japan.
Surg Radiol Anat. 2020 Jul;42(7):831-834. doi: 10.1007/s00276-020-02460-4. Epub 2020 Mar 26.
We incidentally observed the occipital artery (OA) arising from the cervical internal carotid artery (ICA) at the level of the C2 vertebral body on magnetic resonance (MR) angiography in three patients. In the rare case in which the OA arises from the ICA, it is generally at its origin. The OA arises from the cervical ICA when all but the distal part of the anastomosis of the primitive proatlantal artery between the ICA and vertebral artery persists. Careful review of MR angiographic images is important to detect rare arterial variations, and both partial maximum-intensity-projection images and source images aid their identification on MR angiography.
我们在三名患者的磁共振血管造影（MR 血管造影）中偶然观察到枕动脉（OA）从颈椎颈内动脉（ICA）在 C2 椎体水平发出。在 OA 发自 ICA 的罕见情况下，通常在其起源处。当颈内动脉和椎动脉之间的原始前颅动脉吻合的除了远端部分以外的所有部分都持续存在时，OA 发自颈内动脉。仔细审查 MR 血管造影图像对于检测罕见的动脉变异非常重要，部分最大强度投影图像和源图像有助于在 MR 血管造影上识别它们。
