MRI of the brain demonstrates a small posterior fossa with low lying tentorial attachment posteriorly. The tectum is beaked and the corpus callosum dysgenetic.
On the superior slices of the T2 axial series, you can also see interdigitation of the medial hemispheric sulci to do absence of the falx.
Colpocephaly and hydrocephalus are present. Paediatric VP drain has migrated out of the ventricles.