what is ventriculomegaly
From Wikipedia, the free encyclopedia. Ventriculomegaly is a brain condition that occurs when the lateral ventricles become dilated. In fetuses, the most common definition uses a width of the atrium of the lateral ventricle of greater than 10 mm.This occurs in around 1% of pregnancies.lthough evaluation of lateral ventricles dimensions is decisive for establishing a diagnosis of ventriculomegaly, the shape of the ventricular system, including that of the frontal horns, is also important.