John,
Oh, somewhat in your shoes.
CK last year, but also discovered (at same time of AN), a chroidial cyst midbrain, as well as Chiari 1 malformation... as well as my other medical issues.. and to think, I'm only a young (OMG!

) upcoming 46!)
I thought radio-surgery can be re-performed. Have you had a chance to speak to the dr's on the Cyberknife Patient Support Board? (
http://www.cyberknifesupport.org/forum/). These are docs that volunteer their time, do many forms of treatment (ie: Gammaknife AND Cyberknife) and are VERY well versed in radio and surgical protocols. They may be able to offer ideas to you. Just a thought.....
Please keep in mind MRI's have a +/- 2mm, so it may not have shrunk or have minimal growth but you should still be ok. My understanding (from a radio-surgical standpoint) is that although the AN MAY shrink slightly, that is not the ultimate goal of the radiosurgery... which is to kill the core DNA of the growth to prevent further growth. As long as the growth is stunted, then all is going according to plan as long as the core DNA is dying it's lovely death. Anyone else want to chime in thoughts on this past comment, please do.
Hang in there.
Phyl