SCN1A and encephalopathy, progressive, early-onset, with brain edema and/or leukoencephalopathy: Identification of a genetic etiology can impact treatment choice in epilepsies, in terms of selecting or avoiding specific treatment choices, for example, sodium channel blockers are recommended in epilepsies caused by gain‐of‐function variants in sodium channel genes but should be avoided in Dravet syndrome, caused by SCN1A loss‐of‐function variants.13