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Diagnostic findings
Crohn's disease Ulcerative colitis
Terminal ileum involvement Commonly Seldom
Colon involvement Usually Always
Rectum involvement Seldom Usually (95%) [1]
Involvement around
the anus
Common [2] Seldom
Bile duct involvement No increase in rate of primary sclerosing cholangitis Higher rate [3]
Distribution of disease Patchy areas of inflammation (skip lesions) Continuous area of inflammation [1]
Endoscopy Deep geographic and serpiginous (snake-like) ulcers Continuous ulcer
Depth of inflammation May be transmural, deep into tissues [2] [4] Shallow, mucosal
Stenosis Common Seldom
Granulomas on biopsy May have non- necrotizing non-peri- intestinal crypt granulomas [2] [5] [6] Non-peri- intestinal crypt granulomas not seen [7]