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.