Ulcerative colitis is categorized according to location:Proctitis involves only the rectumProctosigmoiditis affects the rectum and sigmoid colonLeft-sided colitis encompasses the entire left side of the large intestinePancolitis inflames the entire colon
Review Date: 1/28/2016
Reviewed By: Subodh K. Lal, MD, gastroenterologist with Gastrointestinal Specialists of Georgia, Austell, GA. Review provided by VeriMed Healthcare Network. Also reviewed by David Zieve, MD, MHA, Isla Ogilvie, PhD, and the A.D.A.M. Editorial team.