surgical viability

A CT scan report said - a 3mm diameter right anterior communicating artery is demonstrated. The rest of the circle of Willis has a normal appearance. A small right posterior communicating artery is demonstrated. There doesnt appear to be a significant left posterior communicating artery. No other abnormality is seen. Summary. 3mm right anterior communicating artery aneurysm. Despite possible family history - being so small I havent till recently worried much about this. My understanding should I need intervention at some time - is that I do not have the advantage of alternate blood flow prospects through posterior communicating arteries that we are usually provided by nature. I would value any feedback or advice on my condition - in particular (1) if my eneurysm does expand, what does its position mean for surgical viability. Also Im about to have serious drug (interferon) treatment for another condition - does anyone know if this might affect the status of the aneurism (aneurysm) ?  Archer_