The brain shows supratentorial (4th ventricle is normal) hydrocephalic changes reaching about 4 cm at the level of right atrium with markedly dilated both occipital horns (colpocephaly) .
The right choroid plexus is enlarged ( measuring 4.2 x 1.2 cm), shows cystic changes , extending to the frontal horn and cerebral parenchyma in the fronto-pareital regions. It elicits rim of bright signal in T1WI, intermediate in T2WI with evident restricted diffusion. Normal left choroid plexus
Agenesis of corpus callosum manifested by colpocephaly, parallel arrangement of lateral ventricles and absent precentral gyrus.
Normal posterior fossa structures.