Fig. 4From: How to locate the dural defect in a spinal extradural meningeal cyst: a literature reviewFlow void on MRI. A 7-year-old boy had weakness of the lower extremities, with dysuria, for 3 days. A Preoperative sagittal MRI showed a flow void with a SEMC at L1 level. B No flow void was found in axial MRIBack to article page