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CSF cytology and HIV serology were both negative. EMG, however, confirmed the clinical findings of polyradiculopathy. T1W and T2W MRI of the lumbar spine demonstrated diffuse thickening of the nerve roots of the cauda equina, which enhanced following intravenous gadolinium administration (Figs. 1 and 2). No parenchymal involvement was seen.
The most common pattern of LMCA on MRI is diffuse thickening of nerve roots, which enhance after the administration of intravenous gadolinium. Nodular, sometimes bulky, deposits of tumor on the surface of nerve roots can occasionally be seen.