Ischemic bowel disease is one of the common causes of acute abdomen, which results from insufficient bloodflow to the small bowel and colon caused by arterial or venous occlusion or mesenteric vasoconstriction. Earlydiagnosis by clinical, laboratory, and radiologic findings is often difficult and delay in adequate therapyresults in substantial morbidity and mortality. CT is known to be useful for the evaluation of patients withsuspected bowel ischemia or infarction. This study describes the spectrum of helical CT findings in acute andchronic mesenteric ischemia due to various causes, and explains the value of CT findings for specific diagnosis.