Hemiballismus
Rare, extreme form of the movement disorder chorea / From Wikipedia, the free encyclopedia
Hemiballismus or hemiballism is a basal ganglia syndrome resulting from damage to the subthalamic nucleus in the basal ganglia.[1] Hemiballismus is a rare hyperkinetic movement disorder,[2] that is characterized by violent involuntary limb movements,[1][3] on one side of the body,[4] and can cause significant disability.[5] Ballismus affects both sides of the body and is much rarer.[4] Symptoms can decrease during sleep.[6]
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Hemiballismus differs from chorea in that the movements occur in the proximal limbs whereas in chorea the limb movements are in the distal limbs.[4] Also in chorea the movements are more dance-like, flowing from one region to another.[7]