Ultimately this table gives you the comparison and contrasting of ulcerative colitis and Crohn's.
In ulcerative colitis, mucosal inflammation; in Crohn´s disease, transmural.
Ulcerative colitis: only the colon, begin in the rectum,
in Crohn´s disease: anywhere in the GI tract.
Ulcerative colitis: its continuous involvement with ulcerations.
In Crohn´s disease: It will be skip lesions. In ulcerative colitis,
it will be bloody diarrhea.
You could find this in Crohn´s as well. In ulcerative colitis,
more involvement with colorectal cancer.
Could Crohn´s disease be involved with colorectal cancer? Sure, it can.
Crohn´s disease: Transmural segmental. Any portion of GI.
Most common however would be the ileum, ileocecial region.
Hence, B12 deficiency and also enterohepatic circulation may be compromised.
Because of that transmural, you´ll have fistula formation
and maybe perhaps even strictures due to ulceration that might be seen.
More abdominal pain, diarrhea,
less bleeding than what you would expect to find with ulcerative colitis.