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MediumO&GEctopic pregnancyca-mccqe1ca-rcpsc-em

A 29-year-old woman presents with 8 weeks of amenorrhoea, lower abdominal pain and light vaginal spotting. A urine pregnancy test is positive. Transvaginal ultrasound shows no intrauterine gestational sac, and serum β-hCG is 1800 IU/L. What is the most likely diagnosis?

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