Ultrasound findings most consistent with alobar holoprosencephaly

The main differential diagnosis includes:

• hydranencephaly
  • thalami usually visible and not fused
  • falx cerebri usually present
  • no associated midline facial abnormalities
  • no cortex present, or sometimes small islands of tissue
• severe hydrocephalus
  • thalami not fused
  • no associated midline facial abnormalities
  • falx cerebri usually present​
  • bilateral choroid plexus