Glossary of Sleep-related terms

Lennox-Gastaut syndrome

An encephalopathy of undetermined etiology seen in children and occasionally in adolescents which is usually manifested by the association of: (1) tonic generalized epileptic seizures, brief atonic epileptic seizures, and petit mal variant (q.v.) absences; (2) mental deficiency; (3) radiological signs of diffuse cerebral atrophy; and (4) interictal diffuse sharp and slow wave EEG discharges at about 2/sec (petit mal variant discharges, q.v.).4