由椎动脉瘤引起的延髓外侧综合征(Wallenberg综合征)很罕见,现报告1例如下。1　病例　男,42岁。于1999年10月29日无任何诱因出现右后枕部持续性胀痛,无发热及其他不适。4天后头痛加剧,波及右额部及右上面部,伴右面部潮红、多汗,并感头晕、视物旋转,时有复视、恶心呕吐,走路不稳 Lateral aneurysm caused by the medullary medullary syndrome (Wallenberg syndrome) is very rare, a report is as follows. 1 case male, 42 years old. On October 29, 1999 there was no incentive for persistent pain in the right posterior occipital region, with no fever or other discomfort. 4 days after the headache intensified, affecting the right forehead and upper right facial, with the right facial flushing, sweating, and feel dizzy, depending on the material rotation, sometimes double vision, nausea and vomiting, walking unsteady