juvenile myoclonic epilepsy
juvenile myoclonic epilepsy n epilepsy that typically begins during adolescence or late childhood and is marked by myoclonic seizures which occur shortly after awakening and are often followed by tonic-clonic seizures or sometimes by absence seizures

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a syndrome of sudden myoclonic jerks, occurring particularly in the morning or under conditions of stress or fatigue; seen primarily in children and adolescents. Occasionally the jerks may progress to generalized tonic-clonic seizures, but there is no mental deterioration. Called also Janz syndrome.

Medical dictionary. 2011.

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