Hi, Mike and welcome.
You mention types of surgery, but with an acoustic neuroma your size you might want to consider radiation. Treatment is a personal choice, as you'll soon see, but you want to investigate all your options. To that end, somewhere in your decisionmaking process you should consult with a doctor who does radiation so you get both sides of the picture.
Being diagnosed with an AN is very frightening and overwhelming. A good place to start, in addition to the Forum, is the ANA. If you contact them, they will send you their informational brochures which many find to be very valuable. They are written in plain, easy to understand language for all those non-medical personnel among us
Good luck on your AN journey, and please do not hesitate to ask us anything. That's what we're here for - and we'll be glad to help in any way we can.
Best,
Jan