Tags: Disease.
Hemiballismus formerly called ballism is a very rare movement disorder caused in most cases by a decrease in activity of the subthalamic nucleus of the basal ganglia resulting in the appearance of flailing ballistic undesired movements of the limbs. It can also appear rarely due to certain metabolic abnormalities. It is a rare movement disorder being 500 times more rare than Parkinson’s disease. Hemiballismus can cause significant disability. Symptoms can decrease during sleep.