During a diagnostic laparoscopy for suspected ectopic pregnancy, the surgeon notes a 3 cm bulging, bluish mass in the ampullary portion of the fallopian tube with active bleeding through a tubal opening. What is the specific ultrasound finding preoperatively that most strongly suggests this condition?
- A Tubal ring sign ✓
- B Pseudosac
- C Free fluid in the pouch of Douglas
- D Empty uterus
Correct answer: A. Tubal ring sign
Explanation
The tubal ring sign is an echogenic ring surrounding an unruptured ectopic pregnancy in the adnexa, distinct from the ovary. B pseudosac is an intrauterine fluid collection. Free fluid and empty uterus are supportive but not the most specific findings for an unruptured tubal ectopic.
Reference: Williams Obstetrics, 26th ed.
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