Diagnosis of Crohn Disease Barium x-rays of the small bowel Abdominal CT (conventional or CT enterography) Sometimes barium enema, magnetic resonance (MR) enterography, upper endoscopy, colonoscopy, and / or video capsule endoscopy Crohn disease should be suspected in a patient with inflammatory or obstructive symptoms or in a patient without prominent GI symptoms but with perianal fistulas or abscesses or with otherwise unexplained arthritis, erythema nodosum, fever, anemia, or (in a child) stunted growth.