Fig 9. A 73-year-old man complained of weakness and numbness of the lower extremities after walking about 300 meters, but no obvious sensory loss and muscle weakness were noted. A and B, Precontrast T1-weighted (500/35) sagittal (A) and axial (B) conventional spin-echo MR images indicated a diagnosis of LSCS at L4/5 disk level (arrows). C and D, T1-weighted (500/35) sagittal (C) and axial (D) MR images acquired at L4/5 disk level obtained after 0.1 mmol/kg intravenous Gd-DTPA administration showing the generalized central canal stenosis as well as punctuate areas of intrathecal enhancement (arrows), which indicates a breakdown in the blood-nerve barrier.