Welcome to NT
Your uncle is lucky to have you. Tell him hello for me.
I don't know a lot about aneurysms. It sounds pretty scary. There are others here who are looking for answers about CT scans with those findings.
There's lots of info here. I'll give you a link to General Health Conditions and Rare Conditions to start with.
http://neurotalk.psychcentral.com/forum2.html
Here is the aneurysm link:
http://neurotalk.psychcentral.com/forum7.html
Just ask if you need more info. Someone may have just the right answer you seek.