Figure 1. Sagittal T1-weighted spin-echo MR image (416/8) of the lumbar and sacral spine reveals extensive dural ectasia (short arrow) beginning at the L5-S1 level, with expansion of the dura and thinning of the adjacent sacrum both anteriorly and posteriorly. There was mild lumbar scalloping (LS) (long arrow) of the posterior lumbar vertebral bodies.