<prompt> Common site of regional enteritis isColonRectumDistal ileum and colonCaecum  <response>: Crohn disease Terminal ileitis or regional enteritis Crohn disease CD is an inflammatory bowel disease IBD which is characterized by -Sharply delimited and typically transmural involvement of the bowel by an inflammatory process with mucosal damage.The presence of non-caseating granulomas.Fissuring with the formation of a fistula.Any portion of intestine can be involved but most commonly small intestine is involved.Small intestine 40Small intestine colon 30Colon 30 