Ischemic colitis differential diagnosis

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Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]; Associate Editor(s)-In-Chief: Cafer Zorkun, M.D., Ph.D. [2]

Overview

Ischemic colitis must be differentiated from the many other causes of abdominal pain and rectal bleeding (for example, infection, inflammatory bowel disease, diverticulosis, or colon cancer).

It is also important to differentiate ischemic colitis, which often resolves on its own, from the more immediately life-threatening condition of acute mesenteric ischemia of the small bowel.

• The symptoms of colitis such as diarrhea especially bloody diarrhea and abdominal pain are seen are seen in all forms of colitis. The table below lists the differential diagnosis of common causes of colitis:

Diseases	History and Symptoms				Physical Examination				Laboratory findings
	Diarrhea	Rectal bleeding	Abdominal pain	Atopy	Dehydration	Fever	Hypotension	Malnutrition	Blood in stool (frank or occult)	Microorganism in stool	Pseudomembranes on endoscopy	Lab Test 4
Allergic Colitis	+	++	+	++					++
Chemical colitis	+	++	++		+	+			++		+
Infectious colitis	++	++	++		+++	+++	++	+	++	++	+
Radiation colitis	+	++	+		+			+	++
Ischemic colitis	+	+	++		+	+	+	+	++
Drug-induced colitis	+	+	++			+			++		+

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