letranger:
Hello and welcome. No one wants what it takes to be here (an acoustic neuroma tumor) but we're glad you found the informative ANA website - and this forum. No, we're not physicians, but we do stand ready to offer whatever practical advice we can.
Thankfully, you have a small AN. Radiation is very likely a viable option for you. So is surgery. At this point, it would seem as if 'watch-and-wait' may also be feasible. When it comes to treatment approaches, ultimately it's your decision to make, not your doctor's. That means you need to do some research into radiation and, as Bejoi suggested, consult with other physicians. Consider them all and then make an informed decision as to how you'll address this medical problem. Don't agree to have surgery because one doctor, even a well-respected doctor, tells you that you 'must'. You do have more than one option.
We wish you the best and hope you'll use this site and the forums to your benefit.
Jim