Episodic kinesigenic dyskinesia-3 (EKD3) is an autosomal dominant form of paroxysmal kinesigenic dyskinesia (PKD), an episodic involuntary movement disorder characterized by dystonia, chorea, athetosis, and other hyperkinetic movements. The age at onset is around 9 to 12 years of age and symptoms are usually triggered by sudden movement or stress. Most patients have spontaneous resolution of episodes in their early twenties or later. Brain imaging is normal. There is a favorable response to treatment with carbamazepine (Li et al., 2021; Tian et al., 2022; Wang et al., 2022).
For a general phenotypic description and a discussion of genetic heterogeneity of episodic kinesigenic dyskinesia (EKD), see EKD1 (128200). [from
OMIM]