CASE 181

History: An 85-year-old woman presents with abdominal distension.

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

A. Small bowel paralytic ileus

B. Large bowel obstruction

C. Small bowel obstruction

D. Colonic paralytic ileus

E. Pneumoperitoneum

2. What is the most common cause of large bowel obstruction?

A. Tumor

B. Volvulus

C. Adhesions

D. Diverticulitis

3. What is the most common type of colonic volvulus?

A. Cecal

B. Rectal

C. Sigmoid

D. Transverse

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