My AN also showed "darkening" in the middle during the first two MRIs post-GK, which of course was interpreted as a good thing. However afterwards is seemed like it changed shape slightly, but most importantly it constantly kept creeping up in size. However, the growth was very small, to the point that it almost got missed until a watchful radiologist looked back to the original scan. However your growth rate seems very high. I wonder if it could be post-radiation swelling, which can happen even at 2 years post radiation. Do you have the previous scans to compare?
My hearing kept declining after radiation, so when I had surgery it was pretty much gone anyway - now I am completely SSD. I had very minor weakness post-op (perhaps a grade II), which has now completely been restored, except from my eye that does not produce tears. One of the surgeons I had consulted had given me 100% chance of paralysis, because the nerve had been previously radiated and some others 30-50%. I kept consulting until I found a surgeon who I was comfortable with. I should mention however that most of the neurosurgeons said that in their experience surgery post-radiation is not more difficult than normal, it is all on a case by case basis.
Marianna