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FIG 1. Serial axial T2-weighted (A and B) and FLAIR (C and D) images in case 1 obtained 2 (A and C) and 4 (B and D) months after onset of symptoms. FLAIR and T2-weighted images show faint hyperintensity in the left putamen. The finding is more conspicuous on the FLAIR image (C, arrow) than on the T2- weighted image (A, arrow). FLAIR image shows hyperintensities not only in the bilateral striatum (D, arrows) and cerebral cortices, but also in the periventricular white matter (D, arrowheads) with mild cerebral atrophy 4 months after onset. T2-weighted images also show hyperintensities in both the striatum (B, arrows) and periventricular white matter (B, arrowheads), although not as conspicuously as on FLAIR images 4 months after onset. Signal intensity in the cerebral cortex is susceptible to the partial volume artifact with the surrounding CSF on T2-weighted images (A and B).
