s usually presents around the terminal ileum, the end of the small intestine before it joins, through the ileal caecal valve, the
colon) whereas Ulcerative Colitis is confined to the
colon. However, sometimes, albeit rarely, it is impossible for pathologists to differentiate between Crohn's and UC. I have Crohn's Colitis (in both the small intestine and colon), but this is seen in a minority of patients.