Some symptoms of PVL may not be noticeable until the child is at least a few months old. However, if a baby is extremely premature, most doctors will perform the following tests for the condition:
Cranial ultrasound: This allows doctors to see a baby's brain using sound waves. They do this by placing a device on the soft spot on top of the baby's head.
Magnetic resonance imaging (MRI): This takes pictures of the brain using magnets and radio waves to create a detailed image without exposing the baby to X-rays.