I don't remember how much Patch's ultrasound was. He was very sick when he got it done. He stayed at the vet's for about a week. I had been doing the vet hopping thing and by the time I took him to that vet clinic he was in fatty liver. He had a lot of diagnostics done and came home with a feeding tube. The ultrasound can only determine thickening of the intestinal walls and can see any actual growths. As far as the thickening being either IBD or Small Cell lymphoma that would require a biopsy. I chose to treat for IBD with steroids. He had 8 very good years after that. He had the same symptoms, vomiting, anorexia and constipation. I think that is why other vets didn't go to IBD as a possible diagnosis, they didn't think of it because he didn't have the hallmark diarrhea.