A 28-year-old woman presents with acute right lower quadrant pain and 5 weeks of amenorrhea. Transvaginal ultrasound shows an empty uterus, a normal right ovary with a 2 cm corpus luteum, and a 3 cm round mass separate from the right ovary containing a yolk sac. The right tube is identified separately and appears normal. What is the most likely diagnosis?
- A Ovarian ectopic pregnancy ✓
- B Ampullary ectopic pregnancy
- C Corpus luteum of pregnancy
- D Tubal abortion with pseudo-gestational sac
Correct answer: A. Ovarian ectopic pregnancy
Explanation
The mass is separate from a normal ovary and the ipsilateral tube is visualized separately and appears normal. This satisfies the classic diagnostic criteria for ovarian ectopic pregnancy (Spiegelberg criteria), which requires the tube on the affected side, including the fimbria, to be intact and separate from the gestational sac. An ampullary ectopic would involve the tube itself, and a corpus luteum arises from the ovary.
Reference: Williams Obstetrics, 26th ed.
High-yield for: NEET PGINI-CETNExTFMGEUSMLEPLABMRCP
Written and medically reviewed by the StethoPrep medical team.