下腰痛伴坐骨神经痛是临床常见病、多发病.坐骨神经痛又是腰椎间盘突出症(Protru sion of the lumbayinto rrertebral disc PID)的常见病症,而临床拟诊腰椎间盘突出症经手术探查阴性者也并非少见,因此对临床表现酷似PID的其它病症应引起足够重视.我院自1991年～1994年共收治4例骶管内硬膜外囊肿患者,其临床表现酷似PID,现报告如下. Low back pain associated with sciatica is a common clinical and frequently-occurring disease. Sciatica is also a common condition of lumbar intervertebral disc herniation (Protru sion of the lumbayinto rrertebral disc PID). However, clinically diagnosed patients with lumbar disc herniation who are negative for surgical exploration are not Rare, so the clinical performance is exactly like PID other diseases should be given enough attention. Our hospital from 1991 to 1994 were treated in 4 cases of fistula in patients with epidural cysts, its clinical performance resembles PID, the report is as follows.