What else could a dog's round cell tumor be if not mast cell?

Question

My vet thinks this growth on my precious Westie Is cancer and will remove and biopsy Monday, FNA ruled out mast cell and she doubts it’s a histiocytoma or lymphoma. It is skin deep only and is on his front left shoulder. Cooper is almost 9 and acting normal,, What else can it be? She called it a round cell tumor. Pet's info: Dog | West Highland White Terrier | Male | neutered | 8 years and 10 months old | 18 lbs

Ana M, DVM · Accepted Answer

Thank you for submitting your question regarding Cooper. Your veterinarian can submit the samples she collected and send it to a pathologist prior to his surgery. This can help to guide the surgery. However, some times these results can be inconclusive. The mass removal surgery with submitting the entire mass is the best way to reach an accurate diagnosis. Another type of round cell tumor is a plasmacytoma. The other types you mentioned are more common though. I hope this information helps!

What else could a dog's round cell tumor be if not mast cell?

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