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MediumO&GSuspected ectopic pregnancyau-acemau-amc

A 29-year-old woman presents to the emergency department with lower abdominal pain and light vaginal bleeding at 7 weeks' gestation by dates. Her β-hCG is 2500 IU/L and transvaginal ultrasound does not show an intrauterine pregnancy. Which diagnosis is of greatest concern and must be excluded urgently?

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