The problem with endoscopic biopsy is that they can't get a full thickness sample, so it isn't really conclusive. If cancer, lymphangiectasia and Protein Losing Enteropathy need to be ruled out, you may consider talking about a full thickness intestinal biopsy.
Isn't Helio... related to ulcers?
If he has IBD and Tylan, Metro and a diet change are not helping, you may have to go to prednizone or prednisolone. Sometimes it is the only thing that will help. It isn't optimal though and I'm not sure if it is okay with an ulcer.
If the vet isn't talking about all of this (and even trying things like Tylan before surgery), I would get a second opinion.
A fish and potato diet sounds good...
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