SCN1A and encephalopathy, progressive, early-onset, with brain edema and/or leukoencephalopathy: Collectively, for differentiation from SCN1A‐positive Dravet syndrome at onset, it is noteworthy that there are fewer hemiclonic seizures, and they occur as clustered patterns based on our findings, in addition to the well‐known afebrile and short‐duration seizures.