Heterotopic Pregnancy
A 34-year-old woman with a history of appendectomy presented to the emergency department after 45 minutes of acute abdominal pain. Her last menstrual period was 9 weeks before presentation, and a normally conceived intrauterine pregnancy (8 weeks of gestation) had been diagnosed by her gynecologist by means of ultrasonography...

http://www.nejm.org/doi/full/10.1056/NEJMicm1509537
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