Department of Radiology, Saitama Sekishinkai Hospital, 2-37-20 Irumagawa, Sayama, Saitama, 350-1305, Japan.
Department of Neurosurgery, Saitama Sekishinkai Hospital, Sayama, Japan.
Surg Radiol Anat. 2022 Mar;44(3):419-421. doi: 10.1007/s00276-022-02896-w. Epub 2022 Feb 10.
Type 2 proatlantal artery (PA) is a rare type of the carotid-vertebrobasilar anastomosis that arises from the external carotid artery and enters the posterior fossa via the foramen magnum (FM). The type 2 PA is usually large and takes a similar course to the occipital artery (OA). The peripheral branch of the OA arises from the distal segment, just proximal to the FM. The ipsilateral vertebral artery (VA) is usually aplastic or hypo-plastic. We diagnosed a case of relatively small type 2 left PA in a patient with a normally developed ipsilateral VA. Furthermore, the patient had an aberrant right subclavian artery associated with a bi-carotid trunk. The combination of these extracranial arterial variations has not been reported in the relevant English language literature.
2 型前置颈内动脉（PA）是一种罕见的颈动脉-椎基底动脉吻合类型，它起源于颈外动脉，并通过枕骨大孔（FM）进入后颅窝。2 型 PA 通常较大，走行与枕动脉（OA）相似。OA 的外周分支起源于 FM 近端的远端节段。同侧椎动脉（VA）通常发育不良或发育不全。我们诊断了一例左侧相对较小的 2 型 PA 患者，其同侧 VA 发育正常。此外，该患者还存在右锁骨下动脉异常和双颈动脉干。这些颅外动脉变异的组合尚未在相关的英语文献中报道。
