自发性低颅压综合征 (SIH)是指原因不明 ,预后良好 ,颅压低于 70mmH2 O的一组少见征候群 ,临床以起立时剧烈头痛、呕吐及颈部强直为主要表现 ,当平卧时头痛很快消失或减轻为特征[1] 。由于临床较为少见 ,故极易造成误诊。现将我院 1999年 6月～ 2 0 0 1年 7月误诊的 4例SIH报道 Spontaneous intracranial hypotension (SIH) refers to an unknown cause, a good prognosis, a set of intracranial pressure less than 70mmH2O a rare group of symptoms, clinically stand up when severe headache, vomiting and neck stiffness as the main performance, when supine Headache quickly disappeared or reduced as the feature [1]. Due to the relatively rare clinical, it can easily lead to misdiagnosis. Now in our hospital from June 1999 to July 2001 misdiagnosed 4 cases of SIH reported