hemiballismus

[hĕm′ē-bə-lĭzməs]

n.

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.

The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.