In another report by Takayanagi et al., a case of a 10-month-old boy whose electroencephalogram revealed generalized periodic epileptiform discharges was subsequently found to have a de novo mutation of the SCN1A gene consistent with Dravet syndrome [10]. The gene discussed is SCN1A; the disease is encephalopathy, progressive, early-onset, with brain edema and/or leukoencephalopathy.