In a woman with a confirmed tubal ectopic pregnancy, the most frequent site of implantation within the fallopian tube is the:
- A Fimbrial end
- B Isthmus
- C Ampulla ✓
- D Interstitial portion
Correct answer: C. Ampulla
Explanation
About 70 percent of tubal ectopics implant in the ampulla, the widest segment where fertilisation normally occurs. Isthmic pregnancies account for roughly 12 to 20 percent and rupture early because the narrow muscular lumen cannot distend. Interstitial pregnancies are rare, about 2 to 3 percent, but rupture late, near 12 weeks, and bleed massively because of the rich vascularity at the cornual end of the uterus.
Reference: Williams Obstetrics, 26th ed.
High-yield for: NEET PGINI-CETNExTFMGEUSMLEPLABMRCP
Written and medically reviewed by the StethoPrep medical team.