They called today and said they could do an exploratory surgery, but i have to sign a euthanasia consent forum before they do. Im really at a loss of what to do, i don't want him to get cut open and then put down. But i don't want to just have him pts when there's a slight chance the surgery could work. I only have one other middle aged rat and she would be devastated without him. What would you guys do if he was your rat? The lump is already just slightly smaller than a golf ball, and he's losing weight so i don't know how much time he has left.