Yeah, since Crohn's disease is present in the small bowel in most cases (although not necessarily LIMITED to the small bowel), and Ulcerative Colitis is always limited to the rectum and colon, they use the term Crohns Colitis for those who have Crohns disease that is limited to the large bowel like UC, and it often behaves like it - like passing lots of blood for example, which is less common with small bowel disease.