Images of a 71-year-old female with left leg pain Images of a 71-year-old female with left leg pain.A−C, Contiguous axial view T2-weighted MR images obtained at the L4–L5 level were judged as normal bilaterally and assessed as grades 0 and 1 by both observers (arrows).D and E, Conventional oblique and ante... Images of a 71-year-old female with left leg pain.A−C, Contiguous axial view T2-weighted MR images obtained at the L4–L5 level were judged as normal bilaterally and assessed as grades 0 and 1 by both observers (arrows).D and E, Conventional oblique and anteroposterior myelogram images were judged grade 2 bilaterally by both observers at L4–L5 (open arrows). Decompressive laminectomy at L4–L5 reported bilateral root compression in the lateral recess at L4–L5. The patient experienced significant improvement in leg pain at the time of discharge.F−H, Contiguous axial post-myelogram CT images obtained at the L4–L5 level show some canal asymmetry in the lateral recesses (arrows), with slight distortion of the canal in the lateral recess on the right (G, arrowhead). One observer labeled this distortion as root compressive, whereas the other labeled this level as normal in the lateral recesses bilaterally. Walter S. Bartynski, and Luke Lin AJNR Am J Neuroradiol 2003;24:348-360 ©2003 by American Society of Neuroradiology