A rare genetic syndrome with characteristics of severe developmental delay, neonatal hypotonia, seizures, optic nerve hypoplasia and distinct central nervous system malformations including extensive bilateral polymicrogyria, dysplastic or absent corpus callosum and malformed brainstem with loss of demarcation of the pontomedullary junction. There is evidence this disease is caused by homozygous mutation in the TUBA8 gene on chromosome 22q11. [from
SNOMEDCT_US]