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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.
(a) Axial CT scan of the sacrum shows slight expansion of the sacral canal and foramina (curved arrows) by a soft-tissue mass. There is subtle extension of the lesion into the posterior paraspinal musculature (straight arrow).n the sacrum, with respect to the sclerotic phase, cortical thickening most noticeably affects the sacral foramina and the sacral side of the sacroiliac joints (Fig 25). The cortical thickening results in osseous expansion of the sacrum with encroachment on the sacral canal and foramina.