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MediumO&GEctopic pregnancy suspicionca-mccqe1ca-rcpsc-em

A 29-year-old woman presents with 7 weeks of amenorrhoea, lower abdominal pain and spotting. Her last period was normal. Serum β-hCG is 1500 IU/L and transvaginal ultrasound shows no intrauterine gestational sac. She is haemodynamically stable. What diagnosis must be presumed until proven otherwise?

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