I can understand the concern. I also had a right side AN about the same size as yours. Based on the MRI, the surgeon recommended translab in order to save the hearing. I was told I had probably about 60% chance to save the hearing.
I flew to L.A. for the surgery and went through a battery of tests the day before the surgery. Through the day of testing, they dropped my chance of retaining hearing to about 40% to 50%. At the end of the day of testing they suddenly said, "You haven't had such and such test. You have to have that test right away!" So they bustled me off for a test with the audiologist. I'm sorry, I don't remember the name of the test, but it had to do with measuring the signal from the auditory nerve across the brain. The result of that test, at about 7pm the evening before I was supposed to have surgery at 8am the next morning, was that they were not picking up any kind of signal from the auditory nerve across the brain. This, they said, would make it virtually impossible to preserve the hearing, they dropped the chances to less than ten percent, and switched to recommending retrosigmoid. Following the surgery they said it was a very good thing that they had switched to retrosigmoid because the AN tumor, which usually adheres to the surface of the nerve, in my case had intruded down into the body of the nerve. This was why there was no signal and they said made the chance of saving the hearing at 0%. They said they would not have wanted to try to deal with that tumor in a translab surgery at all.
So I have lost the hearing in the right ear. I do have some facial paralysis, but it is not severe. It is unpleasant, but it is not really a problem. But, as a mom of two toddlers, I would put a higher price on preserving the hearing, if possible. One thing I have found that I wasn't prepared for, after losing hearing on one side, is that my ability to triangulate on noises is slim to none. I can hear my cell phone ringing in the house, but I can't tell where the sound is coming from.
I know this may sound discouraging. Certainly, though I was not thrilled with the communication skills of my surgeons, the care and treatment I received was excellent in all respects otherwise. So, I would say, make sure you get all the necessary tests done ahead of time if at all possible and, like the earlier reply, trust your gut. And, if you aren't sure, keep getting additional opinions and keep asking questions. Don't let yourself be crowded into a choice that doesn't feel right. Generally speaking there is no urgency to having the surgery. My AN symptoms were already improving somewhat by the time of my surgery, after having been deteriorating over the prior year and a half.
