a) juvenile myoclonic epilepsy
b) lafora disease
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myoclonus epilepsy any of a group of disorders, of varying etiologies, in which seizures (epilepsy) are accompanied by muscle contractions (myoclonus); the group includes a benign idiopathic form, juvenile myoclonic epilepsy, as well as various progressive inherited disorders, including Unverricht-Lundborg disease, MERRF syndrome, and Lafora disease.Medical dictionary. 2011.