Fig. (3) Axial T2-weighted images (A and B) reveal abnormal thickening and decreased signal intensity along the dura (white arrows), as well as central decreased signal intensity within the thecal sac and along the descending nerve roots of the cauda equina (yellow arrows). Sagittal T2-weighted image (C) demonstrates the intrathecal hypointense signal abnormality at the L4 and L5 levels (arrows), which is intermediate to hypointense on sagittal T1-weighted image (D, arrow).