ICD-11 definition : Ulcerative colitis is a chronic inflammatory disorder of unknown etiology that continuously
causes ulcers in the lining of the rectum and colon. Inflammation is histologically
restricted to the mucosa.;
Ulcerative colitis is a chronic inflammatory disorder of unknown etiology that continuously
causes ulcers in the lining of the rectum and colon. Inflammation is histologically
restricted to the mucosa.