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Thrombotic thrombocytopenic purpura

Axial T2-weighted sequence at the level of lateral ventricles (A), shows bilateral, near-symmetric signal abnormalities in globi pallidi. Axial diffusion b-1000 diffusion-weighted imaging shows symmetric diffusion signal abnormalities in globi pallidi bilaterally (B,C), confirmed as increased diffusion by correspondent apparent diffusion coefficient map (arrow, D). (Contributed by A Hasso and S Janumpally, University of California, Irvine.)

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