I had middle fossa, and travelled out of state, and out of my insurance plan to see Dr. Brackmann at the House Ear Clinic in Los Angeles. If I were you, based upon your statement of your physician being busy, and not having time to answer questions, I would call Dr. Brackmann, who will speak with you, review your MRI scans, and talk frankly with you about your options, and his opinion. He is an amazing man. After seeing him do surgeries the time I was there with my surgery, i'm amazed that he takes the time to review MRIs of many, many other potential patients, calls them when he says he will, and is quite frank about possible course of treatment. he doesn't sell his services, but is just willing to speak in his experience, and help those of us that have AN's, and need to know what to do about them.
You need to do your research on the procedures available, and the surgeon you are dealing with, to get their writings on the issue, results, so you can be comfortable with who you are trusting to do your procedure. Good luck in your search, and feel free to ask me or anyone else if you have any questions. With AN treatment and diagnosis, I discovered there is no such thing as a "stupid question", so just remember, those of us post-surgery types were all in your shoes once, and so we may have asked some of the million questions floating around in your head. Again, good luck.
RON T.