Abstract
The T2-weighted MRI and the diffusion weighted image (DWI) MRI show high signal intensity in the left putamen, and there was a corresponding isointense lesion on the apparent diffusion coefficient (ADC) map. These features are consistent with an ischaemic stroke. The MRI brain was performed four days after symptom onset. A variety of hyperkinetic movement disorders can occur (uncommonly) after strokes in the basal ganglia, or elsewhere in the brain. 1–3 In three relatively large series, the incidence of poststroke chorea/ballism was reported to range from 0.4% to 1.3%. 1–3 Hemichorea and hemiballism are believed to form part of a clinical spectrum, with shared pathophysiologic mechanisms; a frequent observation is for ballism to go through a phase of chorea prior to resolution. 4,5
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