Young Male With Abdominal Pain

A 13-year-old boy presented to the emergency department (ED) after 4 days of abdominal pain without fever or bloody stool, although a year ago, he had had a similar episode and was medically treated for presumed appendicitis. He had normal vital signs but periumbilical and right lower quadrant tenderness; his WBC count and urinalysis results were normal. The emergency physician performed bedside ultrasonography, revealing the diagnosis (Figure 1).

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