The ultrasound images demonstrate:
- the supratentorial cerebral parenchyma is replaced by a large central monoventricle with a thin rim of peripheral parenchyma
- fused thalami
- absent midline structures (septum pellucidum, corpus callosum, and falx cerebri)
- hypotelorism
- small midline structure of the fetal forehead suggestive of a proboscis