DO_rare_slim NCIthesaurus existence starts during childhood electroclinical syndrome Landau-Kleffner syndrome UMLS_CUI:C0282512 A childhood electroclinical syndrome that is characterized by the loss of language comprehension (auditory verbal agnosia) and verbal expression (aphasia) in association with severely abnormal electroencephalographic (EEG) findings during sleep and clinical seizures in most patients. ICD10CM:G40.8 MIM:245570 NCI:C84806 SNOMEDCT_US_2025_09_01:230438007 GARD:6855 MESH:D018887 DOID:2538 disease_ontology ORDO:98818 OMIM mapping confirmed by DO. [SN]. acquired epileptic aphasia Childhood onset