制作颅底血管标本时,发现一例椎动脉颅内段 变异,其左侧椎动脉特别粗大(血管直径为5mm)、直接延续为基底动脉.右侧推动脉较细(血管直径 为2mm)、延续为小脑下后动脉,仅发一小交通支 (血管直径为1mm)与基底动脉相连.查阅国内文献,椎动脉左右粗细不等虽有报道,然而,本文所见的这种左右椎动脉相差悬殊者较少见.作者推测,有类似变异的人,当左侧椎动脉受压时,右侧的小交通支不足以供血.有可能产生脑干缺血症状. When making a cranial blood vessel specimen, a case of intracranial segmental variation of the vertebral artery was found, and the left vertebral artery was particularly thick (with a diameter of 5 mm) and directly extended to the basilar artery. The right anterior artery was thinner (the diameter of the blood vessel was 2 mm) For the posterior inferior cerebellar artery, only a small branch of traffic (vascular diameter of 1mm) connected with the basilar artery.Reference domestic literature, ranging from about the thickness of the vertebral artery has been reported, however, this article shows a great difference between the left and right vertebral artery The authors speculate that there is a similar mutation, when the left vertebral artery compression, the right side of the small traffic branch not enough blood, may have symptoms of brainstem ischemia.