MKS,
I see that you have already asked a few high level questions over on the CPSG board which Dr. Medberry has responded to. I would encourage you to use that forum for any questions that come up for either his perspective or one of the other docs that volunteer to monitor that board.
IMO , it is very important to research the pros and cons of both surgery and radiosurgery in treating an AN and decide which in the end you and your fiance feel most comfortable with choosing. As Dr. Medberry indicated given the growth that has occurred between the MRI's I wouldn't think observation would not be a good course going forward. As I've said in previous posts to other folks I think it is best to find a neurosurgeon who has a lot of experience with AN's and does both types of treatment to get the most unbiased view. If that's not possible then certainly see a surgeon and radiosurgeon , but be prepared for some conflicting information to be offered.
There is a lot of links to useful articles and studies in the archives of this site from other posters which can be useful. Obviously, the sharing of others individual experiences have some value but they need to be read in the context that they are just that, and not indicators of how things will work out for your fiance in whatever he chooses.
Like most folks who post here, I went through the roller coaster of emotions and indecision before I made my choice. You've already been to the CK support group site, if you click on stories, Mark's Acoustic Neuroma you can review the issues and questions that I wrestled with, if that would be helpful. The link to the CK society page has an excellent write up on AN's and the pros and cons of all the treatment options
Everyone who posts here does so because they are either looking for answers or trying to help others so feel free to ask questions here with the understanding that not everyone agrees and no one is a doctor
Let me know if I can help with anything else
Mark
