Methods DSA or MRA was conducted on patients with vertebrobasilar ischemia, 33 cases found with vascular structural abnormalities were collected for systematic analysis and a classification was attempted .

• 方法椎 基底动脉系统缺血病人进行DSA或MRA检查 ,对发现的 33例血管异常者进行系统分析 ,并将其尝试性地进行分型。