椎基底动脉的夹层动脉瘤较少见,而位于大脑后动脉的则更为罕见。本文报道1例大脑后动脉夹层动脉瘤。患者,女,24岁,有偏头痛史,处口服避孕药期。自诉看电视时突然额部痛,眩晕,右视野障碍和右半身感觉异常。入院检查,右视野缺损,右轻偏瘫和右手运动失调;血细胞计数、沉降率、蛋白电泳、血清胆固醇和血凝时间正常,心电图和胸部 X 线检查正常;腰穿为血性脑脊液,红细胞11.52×10~(12)/L,白细胞20×10~9/L,蛋白4000mg/L,离心沉淀后无色素沉看。CT 显示左枕额部低密度区,同日穿刺4血管显示在左大脑后动脉近端1cm 处有两个“腊肠样”肿胀,伴有双腔,超声心动图报告为不规则的二 Vertebrobasilar dissection aneurysm is rare, but located in the posterior cerebral artery is more rare. This article reports a case of posterior cerebral artery aneurysm. Patient, female, 24 years old, with history of migraine, oral contraceptive period. Suddenly forehead pain, dizziness, right visual impairment and abnormality of the right half of the body when watching TV. Right ventricular hemispheresis, right hemiparesis and right hand dyskinesia. Hematology, sedimentation rate, protein electrophoresis, serum cholesterol and hemagglutination time were normal, electrocardiogram and chest X-ray examination were normal; lumbar puncture was bloody cerebrospinal fluid, erythrocytes 11.52 × 10 ~ (12) / L, white blood cells 20 × 10 ~ 9 / L, protein 4000mg / L, after centrifugation no pigmentation Shen look. CT showed a left-occipital lower-density region and puncture 4 vessels on the same day showed two “sausage-like” swelling at 1 cm proximal to the left posterior cerebral artery accompanied by a double-lumen echocardiogram reported as irregular II