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CISMP - MRI lumbosacral spine (A1) T2 weighted sagittal of the lumbar spine, (A2) T1 weighted fat saturated postcontrast and (A3) T2 weighted axial images at the level of L3-L4 vertebrae showing thickening and clumping of the lumbosacral nerve roots within the thecal sac with abnormal postcontrast enhancement (arrows), (B) Normal T2 weighted axial image at the level of L4 vertebra showing normal lumbosacral roots within the thecal sac (arrowhead) for comparison
