Generalized-onset seizure true Generalized seizures are sub-categorized into several major types: generalized tonic clonic; myoclonic; absence; and atonic. UMLS:C0234533 MSH:D012640 HP:0002197 HP:0002409 Seizures of with initial involvement of both cerebral hemispheres. SNOMEDCT_US:246545002 human_phenotype Generalized seizures HP:0007114 HP:0007339 UMLS:C1833488 A generalized seizure is conceptualized as originating at some point within, and rapidly engaging, bilaterally distributed networks. Such bilateral networks can include cortical and subcortical structures, but do not necessarily include the entire cortex. Although individual seizure onsets can appear localized, the location and lateralization are not consistent from one seizure to another. Generalized-onset seizures seizure classification