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My cat has a lump that popped. Can cat breast cancer rupture?

Updated On September 23rd, 2025

Pet's info: Cat | Colorpoint Shorthair | Female | unspayed | 10 lbs

My cat had a lump/s and two vets said it might be breast cancer. The lump has grown and popped. And then i was confused, because i didn't think cancer can pop. I visited another vet and he said it is an erupt tumor. This guy was just telling me how long he jas been a doctor, and when i would tell him i need time to think about a decision, he kept asking me, and asking me. He also was trying to give me an incentive to do it right away. I feel like i was on a game show. I need some more insight?

1 Answer

Most Helpful Answer

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Answered By Dr. Melanie, BVSc MS

Veterinarian

Published on December 22nd, 2016

Poor Kitty! Mammary tumors can grow and rupture, so it is possible that she has a mammy tumor that has burst through the skin. It is important to make a decision quickly about treatment with mammary tumors in cats, as 90% of these tumors are malignant with rapid spread to nearby lymph nodes and mammary glands. The sooner she receives treatment if she has mammary cancer, the better for her. I would recommend making a decision as soon as possible regarding treatment for Kitty.

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