Haginoya et al. (2018) compared FDG‐PET scans in people with Dravet syndrome with confirmed SCN1A variants (n = 8, median age: 4.5 years old, range: 2–29 years old) to a diseased control group that comprised people with epilepsy with normal FDG‐PET scans (n = 8, median age: 9 years old, range: 4–16 years old). Here, SCN1A is linked to encephalopathy, progressive, early-onset, with brain edema and/or leukoencephalopathy.