Just wanted to let you know my sister is also facing this decision and is moving on with the radiation treatment with much support(and being pushed) of her family. I am sure she will be kicking and screaming the whole way. She to is very afraid of the possible side effects and changes her mind everyday, but tomorrow she is getting fit for her mask. Her tumor was about the same size as yours and the dr's feel that it is needed. She might as well get it all done at once and not be a happy camper instead of healing and then not being a happy camper Again! I wish you luck on your treatment!!