Epidemiology

The frequency of paroxysmal kinesigenic dyskinesia (PKD) and paroxysmal non-kinesigenic dyskinesia (PNKD) in the general population remains unclear, although both are thought to be rare disorders. It may be difficult to determine their true frequency since the disorders may remain undiagnosed or underreported. Some reports suggest that familial PKD may be more common in individuals of Japanese or Chinese ancestry than in other populations.

	Diagnosis