假性脊膜膨出又称硬脊膜外囊肿,硬脊膜憩室等,临床上较少见.作者报告2例经碘葡酰胺脊髓造影及CT扫描的诊断体会.例1,男性,65岁,因腰及右小腿疼痛行腰椎板切除术,术中发现硬脊膜上有四个针眼,为术前造影穿刺所致,脑脊液从针眼外漏形成囊肿,手术切除囊肿,缝合伤口前将一片明胶海绵覆盖在有针眼的硬脊膜上.术后2个月疼痛复发再次入院,检查见右腿无力,右膝,跟腱反射消失,在椎板切除术切口疤痕的下方可触及一局限性膨出,行碘葡酰胺脊髓造影,对比造影剂从腰段蛛网膜下腔外漏到椎旁软组织内,但不能显示漏口的准确部位,接着作仰卧和俯卧位的腰椎CT扫描,清晰地显示出 Pseudomembranous bulge, also known as epidural cysts, dura diverticulum, clinically rare, the authors report 2 cases of iodogamide myelography and CT scan of the diagnosis.Example 1, male, 65 years old , Lumbar and right leg pain due to lumbar laminectomy surgery was found on the dura four needle eyes, due to preoperative angiography puncture, cerebrospinal fluid leakage from the eye to form a cyst, surgical removal of the cyst, the wound before a Gelatin sponge covered in the eye with a dura .After 2 months of recurrent pain recheck, see the right leg weakness, right knee, Achilles tendon reflex disappeared, laminectomy incision scars below reach a limitation Bulging, Iodoglucosamycin myelography contrast contrast agent from the lumbar arachnoid leakage to the paravertebral soft tissue, but can not show the exact location of leakage, followed by supine and prone position lumbar CT scan, clearly Shows