Local Control, Quality of Life and Toxicities in Adults With Benign or Indolent Brain Tumors Undergoing Proton Radiation Therapy

The main purpose of this study is to see how well the tumor is responding to the Proton Radiation up to 5 years after the participant receive it. The investigators are also looking for how this type of radiation affects the quality of life as well as any type of side effect the participant may have after the radiation is administered. The FDA (the U.S. Food and Drug Administration) has not approved Proton Radiation for this specific disease but it has been approved for other uses.