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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.
Symptoms and exam findings for lumbar and sacral root pathology are described below. Of note, L5 and S1 are the most commonly affected roots. L2 root dysfunction: Pain radiates from the low back to the upper leg. If there are sensory deficits, they will affect the lateral and anterior upper thigh.