FOXG1 and atypical Rett syndrome: Based on the MRI findings and early onset of microcephaly, FOXG1 related disease was suspected. FOXG1 gene test showed a de novo frameshift pathogenic mutation FOXG1{NM_005249.3}:c.[396_397ins26];[=];FOXG1{NP_005240.3}:p.[(Gly133Trpfs∗68)];[=] which confirmed the diagnosis of FOXG1 related congenital variant of Rett Syndrome.