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HemibalLism and CT-documented lacunar infarct in the lenticular nucleus Sir: Hemiballism is a rare condition usually due to an infarction or a haemorrhage in the contralateral subthalamic nucleus.' How- ever, in several cases,2 this nucleus has been intact at post-mortem examination. Only a few cases of hemichorea-hemiballism have been reported in which a contralateral vas- Protected by copyright.
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Mas et al. (1987) studied this question.
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