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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 is the most common complication of lumbar puncture, observed in 20-70% of patients. It usually begins 24-48 hours after the procedure and is more common in young adults. The probable etiology is continued leakage of CSF from the puncture site.