<prompt> Common site of regional enteritis is ?ColonRectumDistal ileum and colonCaecum  <response>: Ans. is c i.e., Distal ileum and colon Crohn disease Terminal ileitis or regional enteritis Crohn disease CD is an inflammatory bowel disease IBD which is characterized by ? 1 Sharply delimited and typically transmural involvement of the bowel by an inflammatory process with mucosal damage. 2 The presence of non caseating granulomas. 3 Fissuring with formation of fistula. o Any poion of intestine can be involved but most commonly small intestine is involved. Small intestine -- 40 Small intestine colon -- 30 Colon -- 30 