Alica ~
I'm not certain my situation applies to what you're asking but, for what it may be worth, I'll submit my experience, anyway.
I was diagnosed with a 4.5 cm AN. The neurosurgeon I picked proposed that, to avoid facial paralysis and other problems, he would debulk the AN, that is, cut it down to a size small enough to radiate and in doing so, cut off the tumor's blood supply. Following a 9-hour surgery (retrosigmoid) I ended up with a 2.5 cm AN - and no real surgical complications. Then, 3 months later, I underwent 26 separate FSR treatments designed by my neurosurgeon and a radiation oncologist and intended to kill the remaining tumor's DNA. As my signature states: 'so far, so good'. I'm due for a new MRI scan but have been procrastinating. However, my last MRI (8/08) showed definite signs of necrosis and some minor shrinkage of the remaining tumor. So, I still have a small tumor but it's been irradiated and is responding to the radiation by conveniently dying.
Jim