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hemiballismus

(hĕm′ē-bə-lĭzməs)
n.
  1. Violent writhing and muscle spasms involving one side of the body, usually caused by a lesion of the subthalamic nucleus of the opposite side of the brain.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.