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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.
Headache. A headache is a common side effect of a lumbar puncture, usually developing within 24 to 48 hours of the procedure. Most people describe a dull or throbbing pain at the front of their head, sometimes spreading to the neck and shoulders.