Hi Janice, sorry to hear about the symptoms and diagnosis, and welcome to the club.
I assume you had an MRI with contrast as the basis of the diagnosis. If not, you should get one, it is the definitive test.
If you can, call the MRI place and get a copy of the MRI and radiologist report on CD. If you can't make your own copies from that, ask for several.
Then I would get onto the cyberknife support forum here:
http://www.cyberknifesupport.org/forum/In addition to getting up-to-date information on radiation (I think your ENT is going by the old 1991 NIH consensus that radiation is for old people, sick people, and sissies), you can ask around about ENTs with experience in treating ANs, and explore issues in radiation treatment.
I would also get in email contact with one of the doctors on the same site:
http://www.cyberknifesupport.org/about_the_doctors.htmlYou could contact Dr. Medbery in Oklahoma, or Dr. Spunberg, in Palm Beach Florida. Email addresses are at the link. They both respond frequently to questions posted on the forum, and will respond to email as well. I believe Dr. Medbery will offer to evaluate your MRI for you no charge, but I would email him first to see. I contacted Dr. Chang at Stanford, CA this way, and then sent him a CD copy of the MRI and lab test reports.
For a small tumor, when balance is not a big issue and there is useful hearing worth preserving, it makes a lot of sense to use Cyberknife. The results in the last 10 years have been very good. I assume since you are posting under radiation that you want to find out more about it.
The surgical approach you doctor mentioned as "from above the canal" is called middle fossa. In some cases, it produces very good results and preserves hearing. However in other cases hearing is lost, and some facial nerve issues result. If you are considering surgery, I would do some research on it on this forum, and seek out a center that does AN surgery well. There is a good ear clinic in Tampa, for instance.
Steve