Fig. 6From: How to locate the dural defect in a spinal extradural meningeal cyst: a literature reviewTwo-needle puncture digital subtraction myelography technology. A 35-year-old woman had low back pain for 4 years. A Preoperative MRI revealed a butterfly vertebra and a SEMC. B and C We performed two-needle puncture digital subtraction myelography which failed. D and E No cleft was found during digital subtraction myelography. F The cleft was found during intraoperative exploration. The drawback of these digital subtraction contrast examination techniques is that the boundary of the subarachnoid space and cyst cannot be shownBack to article page