A year ago, a CT scan decided to throw in a bonus since it did not find what it was intended to. I either have a fenestration or an aneurysm in my communicating artery. The CTA was not more definitive. Next month is my 1 year follow-up CTA. Any questions I should ask my neurosurgeon, assuming I get to actually get to see him this time and not his PA? I really want his opinion of whether it is a fenestration or an aneurysm. That does not seem to me like too much to ask.