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Hemiballism (Ballism)
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Hemiballism (Ballism)

Ballism consists of violent flinging movements of the limbs due to involuntary contraction of the proximal limb muscles, and usually affects only one side of the body (hemiballism). It may be continuous or occur in attacks lasting several minutes. The most common cause is an infarction or other destructive lesion of the subthalamic nucleus (STN). Diminished neural outflow from the STN leads to increased activity in the thalamocortical motor projection.



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