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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.
When the thecal sac, or sometimes called the dural sac, is compressed enough to displace the nerve roots of the cauda equina, it begins causing symptoms. The nerve roots of this area are somewhat distributed and firmly wrapped in tissues similarly to what you'd find inside a very large guage wire.hen the thecal sac, or sometimes called the dural sac, is compressed enough to displace the nerve roots of the cauda equina, it begins causing symptoms. The nerve roots of this area are somewhat distributed and firmly wrapped in tissues similarly to what you'd find inside a very large guage wire.