T1 weighted axial MRI reveals an intermediate signal mass in the lateral ventricle. T1 weighted axial MRI after gadolinium shows intense, homogeneous enhancement of the mass in the lateral ventricle. T2 weighted axial MRI shows intense surrounding vasogenic edema. In children, they usually arise in the trigone of the lateral ventricle. In adults they commonly arise in the fourth ventricle.
Patients usually present with hydrocephalus.
Parenchymal invasion with edema may occur.