SCN1A and encephalopathy, progressive, early-onset, with brain edema and/or leukoencephalopathy: Identification of deleterious SCN1A mutations in five young infants with clinically suspected Dravet syndrome helped early diagnosis (Case 13, 38, 65, 115, 140) and led to the discontinuation of oxcarbazepine (Case 13) that exacerbated seizures.