Gamma knife and Cyber knife are the two main radiation types, with a couple of others also. Look for large centers that advertise doing vestibular schwannomas. You want someone that does a lot of them and can give you advice from experience. Also, if you can find someone that does surgery and radiation, that reduces bias. The big centers are generally all very good because they are geared toward their "customers", and they operate like clockwork. Most communicate quite well to boot. I have heard two different opinions on aggressive growth regarding radiation response. From my own personal experience, I went to UVA for GK. Very old center active for decades, the head (Dr. Sheehan) trained with the first center in the US and was fantastic. Great team, all MD/PhDs. Dr. Lunsford at Pittsburgh I believe opened the first US center and trained with the inventor. He and Sheehan publish a lot, so they have lots of experience. I also visited Stanford for Cyber knife (Chang), and they were fantastic as well, but insist on seeing you in person. I chose UVA because Pittsburgh in January wasn't appealing, and Sheehan I swear will email you from the shower. The guy was always accessible. Also, Cyber knife is newer, and GK has a longer track record of success. Mine was on my facial nerve, so I did a lot of research. Search McCrue on this site, he went to UVA as well.