CASE 95

History: A 60-year-old woman presents with 6 hours of abdominal pain. History includes bowel resection for angiodysplasia and more recent laparotomy for division of adhesions.

1. Which of the following should be included in the differential diagnosis of the imaging finding shown in Figure A? (Choose all that apply.)

A. Large bowel obstruction

B. Small bowel obstruction

C. Adynamic ileus

D. Gastroparesis

E. Enteritis

2. What is the origin of the gas in dilated bowel in a patient with obstruction?

A. Swallowed air

B. Bacterial production

C. Outgassing of dissolved gases

D. By-product of digestion of food

3. Strangulation is closed-loop obstruction with intestinal ischemia. Which finding on CT is most diagnostic of this complication?

A. Ascites

B. Halo sign

C. Whirl sign

D. Abnormal enhancement

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