CASE 146

History: A 73-year-old woman presents with lower abdominal pain.

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

A. Fluid level in an ovarian dermoid

B. Gas in the urinary bladder

C. Gas in a pelvic abscess

D. Fluid level in the rectum

E. Fournier’s gangrene

2. What is the most common etiology for a colovesical fistula?

A. Bladder diverticulum

B. Ulcerative colitis

C. Colon cancer

D. Diverticulitis

3. What is the most common of the various fistulas of the lower urinary tract?

A. Fistula to skin

B. Fistula to colon

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