Ventriculomegaly (HP_0002119) is an increase in size of the ventricular system of the brain. Also known as: Cerebral ventricular dilatation, Dilated cerebral ventricle, Dilated cerebral ventricles, Dilated ventricles, Enlarged cerebral ventricles, Enlarged ventricles, Enlarged ventricular system, Large cerebral ventricles and cisternae.