Apologies for not making it all the way through the postings... work getting in the way.

I was one of the apparent vast majority that was asymptomatic and the CAA was discovered while being scanned for something else. I had a concussion and my vitals were weird. When the head scan was negative, the trauma center did a full body scan, and found the CAA.

When I saw the vascular surgeon, weeks later, he (mis) read the follow-up scan and said we could do surgery or wait. When the radiologist's report came back, he measured it at 2.9x2.1x2.1... so suddenly I have two risk factors -- the size, and growth since the measurement at the ER.

I recall that the Texas Heart Institute did one of the circa-2001 studies and did a lot of surgeries. The author still works there, so I am going to try to reach him he can point to more recent studies, or anything else.