Newborn with hydrocephalus on prenatal ultrasound

MRI of lissencephaly type I classic
Axial T1 (left) and axial T2 (right) MRI without contrast of the brain shows a decreased number of gyri and sulci resulting in a nearly smooth brain. There is ventriculomegaly. Overall the brain has an hourglass or figure of 8 appearance.

The diagnosis was lissencephaly type I classic.