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My cat has a chest mass, and my vet is unsure. What could it be?

Updated On September 23rd, 2025

Pet's info: Cat | Mixed Breed | Male | neutered | 9 years and 3 months old | 22 lbs

My cat has a very large mass between his chest and the vet doesnt know what it is do you have any idea what it may be

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1 Answer

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Answered By Jennifer Summerfield, DVM CPDT-KA

Veterinarian, Certified Dog Trainer

Published on September 1st, 2018

Oh dear! I'm sorry to hear that Bean is having this problem. Unfortunately, there is no way to diagnose what the mass is just by looking at it - he would need to have a biopsy or a fine needle aspirate (FNA) to get a sample of the tissue in the mass for analysis in order to get a specific diagnosis. In general, I can tell you that lymphoma is a common cause of a mass in this area in cats, but there's no way to know for sure if this is what Bean has without further work-up. For a mass or tumor in this area, I would normally recommend referral to a specialist for advanced imaging studies, biopsy or FNA, and discussion of treatment options. Your regular veterinarian should be able to help you set this up, if you wish.

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