Young Woman With Abdominal Pain

A previously healthy 22-year-old woman presented to the emergency department with worsening abdominal pain and emesis for 3 days. Her vital signs were normal. Physical examination revealed a tender mass suspicious for hepatomegaly, extending from the right upper quadrant to the midabdomen. There was no guarding or rebound tenderness on examination. Laboratory study results were unremarkable and serum pregnancy test was negative. Contrast-enhanced computed tomography (CT) was performed (Figures 1 to 3).

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