Table 1.

Ultrasound and magnetic resonance imaging (MRI) in ventriculomegaly (VM)

Ultrasound diagnosis	Main additional abnormalities to exclude on MRI	Reported findingsref
Mild VM	MCD, CC abnormalities	Outcome normal: > 90% 49 Isolated on MRI: 86–99% 16 , 50
Moderate VM	Hemorrhagic lesions, parenchymal damage, MCD, partial CC abnormalities, infratentorial abnormalities, vascular pathologies	Outcome normal: 75–93% 51 Outcome normal: bilateral, 79%; unilateral, 91% 51 Isolated on MRI and outcome normal: bilateral, 63%; unilateral, 100% 52 Isolated on MRI: bilateral, 44%; unilateral, 68% (includes also minor findings with likely little impact on neurodevelopment) 17
Severe VM	Same as moderate VM	Outcome normal: 15–50%; 42% if isolated 53 Isolated on MRI: bilateral or unilateral, 50% 17

MRI has been shown to provide reassurance in most cases with mild or moderate VM. However, in severe VM, normal outcome can be expected in only about 50% of cases with apparently isolated VM on MRI. CC, corpus callosum; MCD, malformation of cortical development; ref, reference.