Suggest Treatment For Vagal Schwannoma

Question : I have a vagal schwanomma that according to my neurologist, neuro surgeon, and radio oncologist is in a very bad place. It's in the cerebellum and there is a concerted opinion that surgery is not an option. When first diagnosed in an MRI, it was .9cm. When the MRI was done again with contrast XXXXXXX it is now 1.6cm. I have a hoarse, gravelly voice - as well as a dry cough. An ENT appt. a few days ago revealed my left vocal cord is paralyzed. They are strongly recommending that I get a radiosteratomy (sp) procedure. My question is - how effective is it (they claim it is 90% effective), and more importantly, since the tumor is intimately involved with the vagal nerve branch, what are the chances that this radiation treatment is also going to take out some of the vagas nerve? I don't have time for a proper second opinion - I can see a guy at Cedars Sinai (Dr. XXXXXXX Black), but not for a couple of weeks. I don't want to wait.