Very interesting.

I have 2 with Asperger's Syndrome. Adults now.

My son had MRI when young to rule out something else and before he was diagnosed on Autism Spectrum. He also has enlarged Virchow-Robin Spaces (Perivascular spaces). It's been many many years since I looked into all that but at the time I came to the conclusion that it was not uncommon in Autism. Daughter hasn't ever needed an MRI.

p.s. there are many journal articles about enlarged Virchow-Robin Spaces and Autism if you ever want to read more about that.
PubMed