蛛网膜下腔出血比较常见 ,约占脑血管疾病的 13%～ 15 %。典型的蛛网膜下腔出血有特殊的临床表现 ,极大部分病例通过询问病史、体检和腰穿即能明确诊断 ,但部分病例由于起病后即有意识丧失 ,或早期无明显的脑膜刺激征 ,因而造成诊断困难 ,发生误诊。本院自 1990年～ 2 0 0 0年 Subarachnoid hemorrhage is more common, accounting for about 13% to 15% of cerebrovascular disease. A typical subarachnoid hemorrhage has a special clinical manifestations, the vast majority of cases by history, physical examination and lumbar puncture that can be a clear diagnosis, but in some cases due to loss of consciousness after onset, or no obvious early meningeal irritation, As a result, diagnosis is difficult and misdiagnosis occurs. Our hospital from 1990 to 2000