Suzanne,
I had a 2cm an removed using middle fossia technique 3 years ago and was recently diagnosed with it returning. I have just got my mri results after having it regrown 6 mths ago. My results are that it hasn't changed in 6 mths. My ent surgeon has told me to do nothing. In fact, he will no longer do middle fossa ops - only translab. However, the real important info was that he won't operate on a small an any more. current research in Europe using 12 years of MRI experience, identifies that a small an may in fact stay a small an. Furthermore, it may have been small for many years already. I was all geared up for CK treatment regardless of whether my an has grown or not and now I am going to wait. my current an is 19mm.
In fairness, i did query radiation treatment and my dr said that it is an option and there are plusses and minuses for both surgery and radiation. But he said that i don't have to do anything so I won't. I now regret almost panicking when i found out to have the op asap. Hindsight is a wonderful thing.
Maybe you should question your doctor's a little more before jumping in. My dr regrets using middle fossa. Anyway, everyone is different and it depends if your an is pressing into your brain stem or not.
regards
Larry