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Hello, I'm Dr Gary. I've been practicing veterinary medicine since 2007. I look forward to helping with your questions/ concerns.
I'm sorry that you don't have an answer yet. I don't think an ultrasound is going to give you the answer either. You really need to go in surgically to know what the mass is and if it's resectable.
I would put the money into surgery if you're going to pay for something. This way you're getting a diagnosis and treating at the same time.
If surgery is not an option, then I would consider steroids (Prednisolone) to try to shrink it down. Pred is used for the most common abdominal mass in cats- Lymphoma. It would not be common in a cat this young, but we can see it at times when cats are Feline Leukemia or FIV positive. They are much more likely to develop Lymphoma when younger.
I hope this helps give you some ideas of options. Let me know if you have any other questions.
Not all shelters will test for FeLV/ FIV. It is definitely something worth considering.
Pred is something that your vet could prescribe if you decide to hold off on further diagnostics and just go with a symptomatic treatment.
Here at an ER in Michigan, that would run ~ 2000. In a day practice, it may be(###) ###-#### With a boarded specialist, it could run 3000-5000. It can vary quite a bit.