CK and GK have physical fractionated properties, but not nearly so as the hypofractions used in FSR.
I'd want to investigate this a little with someone if she can get outside Kaiser.
One thing about the 3 nerves in close proximity, the auditory is a sensory
nerve, so very delicate, same too the vestibular (2). The facial nerve is a motor
nerve, so more resilient, but a scalpal nick and one has facial weakness. Sounds like a debulkng case may unfold if this is left to a neurosurgeon/neurotologist team.
Using the Middle Fossa approach, the facial nerve lies right on top after opening the top of the IAC. That may, or not, be advantageous depending exactly where on the facial nerve the AN is located.
A delicate situation no matter what! But, one can include a nerve in the central beam area if the radiation is hypo
fractionated. After all, there exists about 1.5 cm. radiation spray in any AN radiological procedure, except Proton Beam.
Best wishes, Michelle!
I have the impression that radiation is generally not recommended for a FS, on the grounds of almost certain damage to the radiated nerve, since it lies in the centrefield of the radiation. Unless fractionated approaches work better. I might be completely wrong on this, you may want to ask the docs at the Cyberknife forum http://www.cyberknife.com/Forum.aspx for an opinion.