Two little nuggets to throw into this discussion--
First, on the U. Pittsburgh website, one of my favorite stats is that a relatively high pct. of neurosurgeons say that they would delay having any treatment on a small AN, even if it shows some growth, if they were the patient.
Here's the UPitt site, which I found very useful, although it's starting to fall out of date:
http://www.acousticneuroma.neurosurgery.pitt.edu/Second, when I was doing my research on hearing preservation a few years ago, I found out that my docs at the U. of Florida refused to even enter that discussion because they said that too many places used unrealistically low standards (like 50/50) in order to keep their stats high. Since I was treated two years ago, I have heard that the U. Florida docs have finally agreed that studies show a better chance of hearing preservation from fractionated (multi-shot) CK over one-shot approaches.
I had my treatment two years ago (one-shot LINAC) on a 7mm AN, and as far as I can tell, it seems to have arrested what was pretty rapid hearing deterioration. I haven't bothered to go back and get my hearing tested, because there's nothing I can do about the results, but my annual MRIs are showing good indications regarding the AN.
I think having even compromised hearing on one side is better than nothing, though I do have trouble hearing people speaking from my weak side. My conclusion is that it makes a lot of sense to put off treatment until increasing symptoms or MRI indications of significant growth make it necessary. After that, fractionated CK probably gives you the best chance of hearing preservation, but as everyone on this board knows, results always vary.
Mac