Originally Posted by AirBear

I had to Google that, never even heard of it so having someone here with that experience is possible but unlikely. I had a number of medical issues before finally having to medically retire, I had access to AMAS thru my company. They were very helpful, I always worked with one Doctor. If you have access to them via your employer or union then use it, if not you can pay. Check with them to see how expensive it is.

https://www.aviationmedicine.com/

Note: I did find this 20 yr old article about a student pilot trying to get a medical that had this. It's a PDF, search it for "arachnoid":

https://www.faa.gov/other_visit/avia...smb_200204.pdf