What's causing my cat's rapidly growing chest lump and poor appetite?

Question

My 1 year old cat, is only 1 month post op for fractured ankle, and has developed a hard walnut sized mass on her chest wall ( under front arm) , rapid growth, poor appetite, very petit cat and she is failing, I initially thought it could be a hematoma but no resolution, no pulsation, no temperature , I would love to hear an honest differential diagnosis. Pet's info: Cat | Mixed Breed | Female | spayed | 1 year and 1 month old | 6 lbs

Dr. Melanie, BVSc MS · Accepted Answer

Poor Mog! It is very concerning that this mass has grown rapidly, and she has a poor appetite as well. It would be rare, but there is a possibility she could have a malignant tumor. That would account for the rapid growth and poor appetite, as well as her failing. I would take her into a vet immediately for this growth. The vet can perform a test called a fine needle aspirate on it. To do this, the vet sticks a small needle into the lump to get a sample of it's cells, and examines the cells on a slide under a microscope. It's usually painless to the animal, and relatively quick to perform. Once the cause is found, the vet can discuss treatment options with you. I'm sure this isn't something you want to hear, the chance it could be malignant, but that unfortunately does pop into my mind. Take her into a vet now.

What's causing my cat's rapidly growing chest lump and poor appetite?

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