Ulcerative colitis is categorized according to location:
- Proctitis involves only the rectum
- Proctosigmoiditis affects the rectum and sigmoid colon
- Left-sided colitis encompasses the entire left side of the large intestine
- Pancolitis inflames the entire colon
Update Date 2/10/2014
Updated by: Todd Eisner, MD, Private practice specializing in Gastroenterology, Boca Raton, FL. Affiliate Assistant Professor, Florida Atlantic University School of Medicine. Review provided by VeriMed Healthcare Network. Also reviewed by David Zieve, MD, MHA, Isla Ogilvie, PhD, and the A.D.A.M. Editorial team.