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Picture of the Month Quiz

A previously well 14-year-old girl presented to the emergency department with a 2-day history of anorexia, nausea, abdominal distention, and lower abdominal pain increasing in severity. She denied fever and diarrhea but reported 1 episode of nonbilious emesis the day prior to presentation. She had never had abdominal surgery, was not sexually active, and was 2 years postmenarche.

Results of her physical examination revealed a soft, tympanitic, mildly distended abdomen, tenderness in the lower quadrants, and a palpable, painful mass in the right lower quadrant. She had voluntary guarding but no rebound. The remainder of the examination was unremarkable. A plain radiograph of the abdomen was obtained (Figure).

Image of Radiograph of distended abdomen

Figure.

What is your diagnosis?

For a complete discussion of this month's case, read next month's Picture of the Month—Quiz Case. For a complete discussion of last month's case, read this month's Picture of the Month—Quiz Case.