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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.
Differentiation within the outer root sheath proceeds along an axis that is parallel to the surface of the skin. The outer root sheath is thinnest at the level of the bulb and thickest in the middle portion of the hair follicle, causing the hair to be more or less eccentric in the follicle. Most of the follicles have some degree of swelling of the outer sheath on the side of bulge.