Paroxysmal exertion-induced dystonia secondary to Erdheim-Chester disease

Paroxysmal dyskinesias (PxDs) are involuntary, episodic moveents including any combination of dystonia, ballism, chorea, r athetosis [1]. The events may be precipitated by sudden volntary movements (paroxysmal kinesigenic dyskinesias) or may ccur spontaneously at rest (paroxysmal non-kinesigenic dyskineias precipitated by caffeine, alcohol, fatigue and emotional stress). n uncommon type of PxD is precipitated by exertion and is called aroxysmal exertion-induced dyskinesia (PED) [1]. Although most ases of PxD are primary, specific cause could be recognized such as ultiple sclerosis, vascular lesions, trauma, or acquired metabolic bnormalities [1].