idiopathic generalized epilepsy juvenile myoclonic epilepsy true true disease_ontology GARD:6808 UMLS_CUI:C0270853 ORDO:307 SNOMEDCT_US_2018_03_01:6204001 OMIM:254770 ORDO:862 DOID:0050326 This syndrome is one of the most common genetic/idiopathic generalized epilepsies and is characterized by myoclonic and generalized tonic-clonic seizures in an otherwise normal adolescent or adult. The EEG shows generalized spike-and-wave and polyspike-and-wave. Photosensitivity is common. http://www.case.edu/EpSO.owl#JuvenileMyoclonicEpilepsy MESH:D020190 NCI:C84796 Xref MGI. OMIM mapping confirmed by DO. [SN]. DOID:4890 Janz syndrome A adolescence-adult electroclinical syndrome that is characterized by brief, involuntary twitching of a muscle or a group of muscles (myoclonus) early in the morning with onset between 12 and 18 years. adolescent/adult-onset epilepsy syndrome