Melinda ~
Hearing retention is always a major concern when considering AN removal surgery so your focus on it is quite understandable. However, I have to offer the caveat that even with Middle Fossa or Retrosigmoid approach surgery, hearing retention cannot be guaranteed. We have some members (Jan comes to mind) who underwent retro surgery in hopes of retaining hearing in the affected ear but woke up from the surgery to find their hearing in that ear gone Still, it's certainly worth giving yourself the best odds for retaining hearing when choosing a doctor and surgical approach. To the best of my knowledge, the translabyrinthine surgical approach does sacrifice hearing. Retrosigmoid and Middle Fossa approaches can 'save' some hearing but the odds are not great. In my case, my hearing in the affected ear was long gone, I had adjusted to it and so, although my neurosurgeon employed the retrosigmoid approach to (partially) remove my tumor, I never regained hearing in that ear. I've pretty well adjusted to being SSD, although it certainly can be an impediment at times. Fortunately, BAHA (Bone Anchored Hearing Aids) are available and do help - as many of our members will attest. I haven't felt the need for one but that could change at some point in the future. They are pricey (thousands, plus doctor fees) but medical insurance usually will cover them, as they are not really a hearing aid in the conventional sense. That's a separate issue. As Rob mentioned, tinnitus is very common to AN patients. I have it but find it tolerable (I ignore it most of the time). While unwelcome, it is not life-altering, just annoying - maddening, if you allow it to be.
I always advise folks deciding on a procedure/doctor/facility that when considering a surgeon, look at his (or her) personal statistics for good surgical outcomes, not simply what the national average may be. You want a surgeon with years of experience in AN removals. While choosing the procedure is important, I submit that the skill of the surgeon is of the essence. I firmly believe my good surgical outcome (followed by successful radiation treatment - FSR) was due in large part to the experience and skill of my neurosurgeon (a longstanding member of the ANA).
I wish you much success in your research and your surgery.
Jim