Background: A 4-month-old boy with prenatal sonography findings consistent with corpus callosum agenesis and ventriculomegaly presented. Patient was born at 37-weeks from 18-yearold woman, gravida 1 para 1. There was no history of teratogen exposure in utero such as radiation, alcohol, drug or postnatal trauma. There was no family history of brain malformations nor chromosomal abnormalities. Clinically no facial abnormality was observed. The mother had gestational diabetes during pregnancy. The baby was delivered by means of cesarean section because of severe eclampsia at 37 weeks. Postnatal routine physical examination of patient was normal.