Hi, KJ - and welcome!
I just wanted to chime in with the rest of the chorus that is suggesting looking into radiation treatment to deal with your newly-diagnosed AN. A consult with a radiation oncologist should help 'fill in the blanks' and assist you in making a treatment decision.
As my fellow moderator, Steve, noted, modern irradiation techniques are much more focused on pinpointing the tumor and avoiding nearby nerves and brain structures. My FSR (Fractionated Stereotactic Radiosurgery) was carefully 'mapped' by both my neurosurgeon and a gifted radiation oncologist he worked with to 'hit' the remaining AN (I had a partial tumor resection, first, to render the tumor small enough to radiate) and avoid surrounding nerves and tissue. That particular procedure requires the patient to wear a very tight-fitting plastic 'mask' that the radiation operator uses to direct the radiation beams precisely where they are needed. In addition, the patient is strapped to a steel table that is lifted and rotated to, again, hep the radiation technician aim the radiation beam exactly at the correct spot, avoiding surrounding tissues. Other radiation techniques are equally precise. While radiation treatments come in a variety of forms, they are all highly effective, although no doctor can guarantee outcomes. I suffered no adverse effects from my FSR and it appears, 3 years out, to have done what it was intended to do - kill the remaining tumor's DNA. However, my hearing nerve was unalterably compromised prior to my surgery and subsequent radiation, so retaining hearing - as you're (naturally) hoping for - was not an issue for me. I trust that future research and doctor consultations will give you more confidence in radiation techniques and that the folks on these forums can give you all the support you'll need as you prepare to deal with your AN.
Jim