This patient has choreoathetosis of the right arm and leg.
About choreoathetosis
Choreoathetosis is an involuntary jerky movement of the body and extremities. While the term chorea traditionally refers to the dance-like, flowing movements of the whole limb, and the term athetosis traditionally refers to writhing movements of the hand, foot, face or tongue, in fact, most patients have a combination of both movements that is difficult to distinguish. Choreoathetosis may be associated with Huntington’s disease, Sydenhams’s chorea, stroke or as a side effect of neuroleptic or dopaminergic agents.
Localization
Choreoathetosis is due to basal ganglia dysfunction. The exact mechanism is unknown.