Abstract：
Variations at the junction of embryonic internal carotid and vertebrobasilar systems are rare and associated with a high incidence of stroke. During cadaver dissection, we demonstrated for the first time a case of hypoplastic right vertebral artery associated with partial duplication of the distal part of the right P1 segment of a partial fetal posterior cerebral artery (FPCA) and bilateral duplication of superior cerebellar arteries (SCAs), of which, the upper right SCA originated from PCA. We hypothesize that the poor development of the right half of the vertebrobasilar system caused the persistence of FPCA with anomalous origin of the right upper SCA as well as partial duplication of P1 segment of PCA as a remnant of the weak anastomosis between the embryonic right PCA and the basilar system. Such complex variations provide a huge challenge in their diagnosis and in choosing the suitable treatment modality for the stroke.
摘要：
胚胎颈内动脉和椎基底动脉系统交界处的变异很少见，并且与中风的高发生率有关。在尸体解剖过程中,我们首次证明了一例右椎动脉发育不良与部分胎儿大脑后动脉（FPCA）右侧P1段远端部分重复和双侧小脑上动脉（SCAs）重复有关，其中，右上SCA起源于PCA。我们假设椎基底动脉系统右半部分发育不良导致FPCA持续存在，右上SCA起源异常，PCAP1段部分重复，作为胚胎右PCA和基底系统之间弱吻合的残余。这种复杂的变化在它们的诊断和为中风选择合适的治疗方式方面提供了巨大的挑战。
