Has anyone had a rat that was diagnosed with osteosarcomas? I just got back from vacation and Irene has a lump on the back of her right hip and another underneath her left eye that feel extremely hard, like it's just bone underneath. I haven't been able to find a lot of information about what I can do for her apart from palliative care. If you've seen this before, what did your vet recommend for treatment? I called my vet to let her know and we decided that unless they seemed to be causing her pain or began to ooze, there was no reason to bring her in. I'd love to find out some more information about what they might be and what I can do to make sure they aren't bothering her.