Editing Crohn's disease (section)

=== UC ===
{| class="wikitable"
|'''Characteristic'''
|'''Ulcerative colitis'''
|'''Crohn disease'''
|-
|Disease distribution
|
** Colon and rectum
|
** Commonly affects terminal ileum
** May involve any part of the gastrointestinal tract (ie, mouth to rectum)
|-
|Skip lesions (ie, spatially intermittent bowel inflammation)
|
** Rare
|
** Common
|-
|Vascularity of the mucosa
|
** Friable mucosa with loss of vascularity
|
** Normal vasculature adjacent to inflamed mucosa
|-
|Ulceration
|
** Mainly mucosal
** Transmural only in severe colitis
|
** Aphthous ulcers: Small discrete mucosal ulcers
** Transmural ulcers: Deeper ulcers that involve the colon wall
|-
|Cobblestone appearance
|
** Not seen
|
** Common
|-
|Stricture
|
** Rare
|
** Common
|-
|Fistula
|
** Rare
|
** Common
** Examples include perianal, enterocutanous, or rectovaginal fistula
|-
|Perianal disease
|
** Rare
|
** Common
** Examples include perianal fistula or deep anal fissure
|}