What is the complication that occur in crohn and does not occur in ulcerative colitis?

Inflammatory bowel : Both Crohns and Ulcerative colitis are forms of inflammatory bowel diseases. The main differences are that Ulcerative colitis is typically limited to the colon while Crohns lesions can occur throughout the entire digestive tract. Ulcerative colitis lesions usually only erode the bowel lining, whereas Crohns ulcers can penetrate through all bowel layers.