Which is the MOST common site of tubal ectopic implantation?
- A Isthmus
- B Ampulla ✓
- C Fimbrial end
- D Interstitium
Correct answer: B. Ampulla
Explanation
About 70 percent of tubal pregnancies implant in the ampulla, the widest segment where fertilisation commonly occurs. The isthmus is the second most frequent site and tends to rupture earliest because of its narrow lumen. Interstitial pregnancies are rare but cause the most catastrophic haemorrhage because of the rich myometrial vascularity at the cornual region.
Reference: Williams Obstetrics, 26th ed.
High-yield for: NEET PGINI-CETNExTFMGEUSMLEPLABMRCP
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