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Magnetic resonance imaging (MRI) of the lumbar spine in a 69-year-old female with paraneoplastic polyneuropathy. Sagittal T1-weighted (T1W) pre-contrast (a) and post-contrast (b) images show smooth enhancement of the dorsal cauda equina nerve roots (b, solid arrows). There is no appreciable enhancement of the ventral nerve roots (b, dashed arrows).
