Natural history of hypsarhythmia.
D000293:Adolescent; D000328:Adult; D002648:Child; D002675:Child, Preschool; D004569:Electroencephalography; D004832:Epilepsy, Absence / Q000175:diagnosis; D005500:Follow-Up Studies; D006801:Humans; D007223:Infant; D013036:Spasms, Infantile / Q000175:diagnosis*