A 25-year-old woman presents to the Emergency Department with a 2-hour history of pelvic pain associated with no other symptoms. The first day of her last menstrual period was 14 days ago. On examination, her vital signs are as follows:
Blood pressure
108/72 mm Hg
Heart rate
110/min
Temperature
37 °C
Abdominal examination reveals rebound tenderness and guarding. Pelvic examination reveals exquisite left adnexal tenderness. Which one of the following is the most likely diagnosis?
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