About 6 months ago one of my rats, Paige, was diagnosed with bone cancer. I brought her to the vet because her back foot/ankle was swollen. The vet, who regularly sees rats and has always been reliable, diagnosed her with bone cancer after taking an x-ray. At first she was unsure because it looked like the foot was completely shattered, but after researching it she gave me that diagnosis. Paige has been fine since then(other than resp. issues) and the foot/ankle didn't swell any more. In the last few days, her foot/ankle have at least tripled in size. She is still eating very well and drinking, but cannot use that back leg. There is not an open sore and there has never been individual bumps, so I really don't know if it could be bumble foot. The vet previously advised me against amputation but said that would be her only option. She is a little over a year and a half and has been on antibiotics most of her life as she has chronic resp. problems. Should I see another vet? Does it look like a tumor of some sort or could it possibly be bumble foot? Here is the best picture I could take of it--it is a purple color because I decided to try applying blue-kote in the case that it was bumble foot. Thank you.