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The right putamen is hyperdense on CT head (A) and hyperintense on T1-weighted MRI brain (B) which is classic for hyperglycemia-induced hemichorea-hemiballism. The characteristic caput medusa of a developmental venous anomaly (arrowheads) is seen on CT head with contrast (C) and gadolinium-enhanced 3T MRI brain (D). CT perfusion demonstrates increased cerebral blood flow (E) and increased cerebral blood volume (F) in the affected putamen (arrows).
