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MediumO&GEctopic pregnancyau-amcau-acem

A 29-year-old woman presents with lower abdominal pain and light vaginal bleeding at 7 weeks' gestation by last menstrual period. Serum beta-hCG is 2500 IU/L. Transvaginal ultrasound shows no intrauterine pregnancy and a 2 cm adnexal mass near the right ovary. She is haemodynamically stable. What is the most likely diagnosis?

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