isClassificationFor epilepsy focal epilepsy true disease_ontology UMLS_CUI:C0014547 MESH:D004828 partial epilepsy An epilepsy syndrome that is characterised by seizures that are preceded by an isolated disturbance of a cerebral function and arise from an epileptic focus, a small portion of the brain that serves as the irritant driving the epileptic response. DOID:2234 single focal epilepsy localisation-related epilepsy Patients with focal epilepsy have focal seizure types, and may have typical interictal and/or ictal EEG findings that accompany focal seizure types (such as focal sharp waves or focal interictal slowing). Imaging showing a focal structural brain abnormality may be supportive, although patients with genetic etiologies and normal imaging can also have focal epilepsy. Focal epilepsies may be unifocal, multifocal or hemispheric. SNOMEDCT_US_2018_03_01:29753000 NCI:C122812 SNOMEDCT_US_2018_03_01:67139004 http://www.case.edu/EpSO.owl#FocalEpilepsy epilepsy classification