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There are numerous extra-gastrointestinal manifestations of inflammatory bowel disease that occur in both ulcerative colitis and Crohn's disease, such as uveitis, conjunctivitis, arthritis, pyoderma gangrenosum and erythema nodosum. Some occur primarily in Crohn's, such as gallstones and renal stones due to the area of bowel affected, while patients with ulcerative colitis are more likely to develop primary sclerosing cholangitis and venous thromboses.