This cat was presented with a visible abdominal mas. On ultrasound the mass seemed to be attached to the stomach and cytology showed multiple mast cell tumors. The mass was removed and came back as eosinophilic sclerotic granulomatous gastritis. This is an uncommon condition in cats, a result of parasites , and certain bacteria.  Most cases actually do not need surgican excisin and respond well to prednisolone.
For more info- http://vet.sagepub.com/content/46/1/63.long