Crohn’s can sometimes be diagnosed with certainty, but it’s often hard to be sure. The pathologist is the most reliable source of information here, but I can’t tell from your post how confident the pathologist was in the Crohn’s diagnosis. You could ask for a second pathological opinion from a GI pathologist (the subspecialty is called “Gastrointestinal Pathology”). You may get some push-back, since second opinions in pathology are uncommon. Many (perhaps most) surgeons in the US won’t do J-pouch surgery if they think the patient has Crohn’s disease. I was turned down by two surgeons before I found the one who did my J-pouch procedure 19 years ago, and I’ve been happy with the results. Good luck!