What areas of the GI tract do cases of Crohn disease affect and which complications may precede the development of intestinal symptoms?

Updated: Jul 26, 2019
  • Author: Leyla J Ghazi, MD; Chief Editor: Praveen K Roy, MD, AGAF  more...
  • Print

About 45% of cases of Crohn disease occur in the ileum and colon, 20% solely in the colon, 33% in the small bowel, and 5% in the gastroduodenal region and perianal region alone (fistula, abscess, anal ulcer or stricture, or fissure). [45] Nearly 20-23% of patients with large bowel or small bowel disease have perianal complications, which may precede the development of intestinal symptoms and manifest as simple skin tags, anal fissures, perianal fistulae, or abscesses. [1] Symptoms may occur without involvement in any other area of the GI tract.

Did this answer your question?
Additional feedback? (Optional)
Thank you for your feedback!