Bleeding

Common

Rare

Abdominal pain

Not severe

Common and can be severe

Palpable abdominal mass

Very rare

Fairly common

Fistulas

Very rare

Common

Involvement of the rectum

95%

50%

Perianal lesions

5%-18%

50%-80%

Postinflammatory polyps

13%-15%

Rare

Toxic megacolon

3%-4%

Rare

Intestinal perforation

2%-3%

Rare

Intestinal stricture

Rare

Common