“…21 It appears that in patients with CD, duodenal biopsies more often yield granulomas than colonic biopsy. [21][22][23] 2) Potential diagnostic value in patients with a diagnosis of IC-upper GI tract involvement may suggest a diagnosis of CD, rather than UC, 24 although upper GI inflammation such as diffuse duodenitis in UC has been reported in the pathology literature 25 . 3) Evaluation for concomitant peptic ulcer disease, NSAID-induced gastropathy, or enteropathy, celiac disease, 26,27 or other small bowel pathology such as eosinophilic enteritis, 28 common variable immune deficiency, 29 and small bowel neoplasia.…”