Lumbosacral MRI of a patient with lymphoma, with radiation-induced arachnoiditis causing severe back pain and leg weakness. A. Sagittal T2-weighted MRI showing clumping of the nerve roots of the cauda equina. B. Axial T2-weighted image at the L3 vertebral level showing clumping of the nerve roots. C. Axial T2-weighted image at the L5 vertebral level showing lateral displacement of nerve roots by acquired arachnoid cysts. There are bilateral metallic pedicle screws.
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