Anna, please do not assume the vet just wanted to "get rid of you". From my point of view from what I've read, and filling in the blanks, it looks as if your vet was planning to operate "depending" on the x-ray results (unless he actually opened her up as literally saw the bladder complication), but he decided against it once he had additional information. I don't know all the relevant info, such as prior medical history, age, current health, etc, but everything can change when new info is found. Mammary tumor removals are usually not a complicated procedures, BUT.... IF there's any involvement with internal tissue or organs, then it becomes a much more serious procedure. Since your rat's tumor has bladder involvement, it would likely not be completely removed, as to keep the bladder sac intact. That would them allow the tumor to continue to grow, probably at an even faster rate since your rat is recovering and his immune system is compromised. Therefore, the surgery would be counterproductive. If he had already started the procedure, then yes, he could have removed the non-invasive mammary tumor, but as I said, that would then require recovery time, during which a new tumor, or the bladder tumor, would grow in its place, and rapidly. Leaving the rat untouched will allow for a longer time to enjoy a decent quality of life. I understand how you feel, but your vet did his job correctly. I currently have a girl with several incredibly fast growing mammary tumors, so fast that they appeared within a few weeks, and are now putting a lot of pressure on her urinary tract and her butt. So much so that she is pooping small poops because it's hard for her to poop. But.... She's still relatively mobile (slow and can't climb, but moves about still), seems to be in no pain, or very little, and is eating, drinking, and going to the bathroom. She is in a hospice environment, so no cage levels, carefully watched while interacting with cage mates, and spends much if her time on the rattie hospital bed lol, yes, they have a hospital bed that is soft, clean, and can be used to nest, tunnel in blankets, play, stay warm, etc, etc. She was considered for surgery by the regions best rat specialist and deemed unsuitable. She's 2⅓ years old and has a slight URI, which is typical of the rescues I rehome. They come to me rehabbed but their prior Myco progression is permanent, so I treat them as soon as I hear a tiny cough. Anyway, so, after I just wrote all that, please don't blame the vet for not operating. If he HAD operated and there was organ involvement, I would have been concerned about his decision making process. But, with mammary tumors, rats can, and do, continue to live a quality life for quite awhile. Just keep an eye on her and love her unconditionally. And... I'm sorry you had to hear this, but I am just trying to help. I included a photo of my girl taken today. If you think she is in bad shape, you'd be right. But she still has time, quality time, as long as I am vigilant and give her the individual attention she needs. She's in no pain, just has difficulties with mobility and the bathroom. But until something gets worse and degrades her quality of life or causes a noticable change in her level of happiness, she will be allowed to live and be loved.