hemiballismus

(redirected from Ballism)
Also found in: Medical.

hemiballismus

[¦he·mē·bə′liz·məs]
(medicine)
Sudden, violent, spasmodic movements involving particularly the proximal portions of the extremities of one side of the body; caused by a destructive lesion of the contralateral subthalamic nucleus or its neighboring structures or pathways.
References in periodicals archive ?
Bilateral ballism after herpes encephalitis with thalamic lesion.
sup][1] Attacks are usually triggered by sudden movement or change in velocity, presenting with choreoathetosis, dystonia, or ballism.
Because tics may resemble other movement disorders, you rule out stereotypies, dystonia, chorea, ballism, and myoclonus (Table 1).