Table I. Major Clinical and CT Findings of Bowel Ischemia.

Features	Arterial Ischemia	Venous Ischemia	Non-occlusive Ischemia
Incidence	60-70%	5-10%	20-30%
Acuity	Acute or chronic	Acute or chronic	Acute or chronic
Clinical Risk Factors	Cardiovascular disease: Atrial fibrillation, post- Myocardial infarction, aortic injury, atherosclerosis. septic emboli. systemic vasculitis.	Bowel strangulation, hypercoagulable state, portal hypertension, venous trauma, infection	Hypotension, heart failure, recent surgery or trauma, medications including recreational
Vasculature	Arterial filling defect, severe arterial narrowing, dissection, aneurysm	Venous filling defect, often with enlarged venous diameter	Non-specific
Bowel Wall Thickness	May be thin acutely, but may be thickened and involved with hematoma, edema, or inflammation	Thickened and edematous	Generally thickened
Bowel Wall Enhancement	Variable; diminished or non- enhancement in regions of pale ischemia; hyperenhancement in areas of reperfusion	Diminished enhancement of mucosa and serosa, target appearance	Diminished enhancement
Mesentery/Fat	Mesenteric fat stranding with free fluid associated with the territory of ischemia	Mesenteric fat stranding with free fluid associated with the territory of ischemia	Mesenteric fat stranding with free fluid associated with the territory of ischemia