Why is it that no-one is considering Proton Beam Radiation? If you search under Keep Smiling , you will see that my husband's proton beam treatment at Mass General was successful. Acoustic neuroma was previously 1.5 cm and was last measured as .5 cm , after treatment. No side effects during treatment and after treatment. We are not up to date on current technology about Proton Beam radiation but it seems that the ANA Discussion Forum might be enhanced if it included more details about this as an option.