Distal colitis with respect to ulcerative colitis refers to:
Distribution of ulcerative colitis: 1. Proctitis - involvement limited to the rectum 2. Distal colitis - Left-sided involvement limited to the colon distal to the splenic flexure 3. Pancolitis -Extensive involvement extends proximal to the splenic flexure, including pancolitis This classification known as the Montreal classification Ref: Journal of Crohn's and Colitis (2012) 6, 965-990.
Proctitis
Left sided colon distal to splenic flexure is only involved
Mid transverse colitis
None of the above