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MediumO&GEctopic pregnancy diagnosisau-acemau-amc

A 30-year-old woman presents with lower abdominal pain and light vaginal bleeding at 6 weeks since her last menstrual period. Serum β-hCG is 1500 IU/L, and transvaginal ultrasound shows no intrauterine gestational sac. What is the most likely diagnosis?

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