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Axial T1 weighted post-contrast MRI at the level of the cauda equina in TBM: A: normal thecal sac, no enhancement, B: mild arachnoiditis with nerve root enhancement, C: moderate arachnoiditis with enhancing thickened clumped nerve roots, D: severe arachnoiditis, hyperintense exudate filling the thecal sac obscuring all roots.
