SCN1A and encephalopathy, progressive, early-onset, with brain edema and/or leukoencephalopathy: In the children without a clinical diagnosis of Dravet syndrome (41 with epilepsy, 178 without epilepsy), 15 (10 with epilepsy) had a different etiological diagnosis (including two with a milder form of SCN1A-related seizures) and in 12 (9 with epilepsy) SCN1A-analysis had been requested by the treating physician and had shown normal results.