PMC4899671_01
21-year-old woman with West Nile virus. A. Axial FLAIR image demonstrates increased signal in the bilateral caudate nuclei (thick arrow), putamen (arrowheads), and posterior thalami (thin arrow). B. Axial postcontrast T1-weighted image demonstrates no abnormal enhancement.
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T2-weighted and T2-FLAIR images in the bilateral caudate nuclei and putamen, as well as the posterior thalamus. There was no abnormal diffusion restriction to suggest infarction, and no abnormal parenchymal or leptomeningeal enhancement (Figs. 1A and B).
21-year-old woman with West Nile virus. Axial postcontrast T1-weighted (A) and sagittal postcontrast T1-weighted, fat-saturated (B) images demonstrate abnormal enhancement of the ventral nerve roots of the cauda equina (arrows) but otherwise no abnormal signal or enhancement.
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Spine MRI demonstrated no extrinsic compression, abnormal signal, or enhancement of the spinal cord; however, there was prominent enhancement of the ventral nerve roots of the cauda equina (Fig. 2).