I had proton beam radiosurgery nearly five years ago at MGH. I had a 1.8 cm AN on the right side. I had a balance problem beforehand and some hearing loss. The balance problem has not improved very much. The hearing in the right ear is now totally gone. I have considerable numbness on the right side of my face, teeth, jaws, half of my tongue, eye socket, lips and so forth. These are areas served by the trigeminal nerve. My facial nerve seems to be okay. The doctors think it is unlikely that the facial numbness was caused by the radiosurgery but I cannot find any other likely cause. I am speculating that the inactivated tumor may be bumping into the trigeminal nerve but haven't found out yet. Specialists have done an ENG, and an MRI looking for other possible causes but everything is normal. I'm interested in finding more people who have been through the proton radiosurgery as well to see how they are doing.