Besides causing the phenotype defined as CMT 4J, mutations in FIG4 have been associated with other neurological phenotypes, including the Yunis‐Varon syndrome (an autosomal recessive developmental disorder) (Campeau et al., 2013; Nakajima et al., 2013; Yunis & Varón, 1980), amyotrophic lateral sclerosis type 11 (inherited as an autosomal dominant trait) (Bertolin et al., 2018; Chow et al., 2009; Dols‐Icardo et al., 2018; Osmanovic et al., 2017), and autosomal recessive familial epilepsy with polymicrogyria (Baulac et al., 2014). This evidence concerns the gene FIG4 and polymicrogyria.