A further more recent study (Zaman et al., 2020), performed with a larger cohort of patients, showed that SCN3A‐related clinical phenotypes show a wide spectrum, including mild epilepsy with intellectual dysfunction, early infantile DEE often associated with polymicrogyria, as well as a phenotype of speech and oral motor dysfunctions associated with polymicrogyria without epilepsy; ictal and non‐ictal autonomic dysfunction or microcephaly can be additional clinical features. This evidence concerns the gene SCN3A and polymicrogyria.