FAT4 and lissencephaly spectrum disorders: Among this case-series, only one patient with lissencephaly has performed next generation sequencing with evidence of a variant of uncertain significance identified in POMGNT2 and FAT4, respectively localized on chromosome 3p22.1 and 4q28.1, related to cobblestone lissencephaly, ventriculomegaly, cerebellar hypoplasia, ocular anomalies and Walker Warburg syndrome.