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MediumO&GEctopic pregnancyau-acemau-amc

A 27-year-old woman presents with lower abdominal pain and abnormal vaginal bleeding. Her last menstrual period was 7 weeks ago. Serum β-hCG is 2000 IU/L, and transvaginal ultrasound does not show an intrauterine pregnancy but reveals a 2 cm adnexal mass. She is haemodynamically stable. What is the most likely diagnosis?

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