<prompt> Most common site of ectopic pregnancy in fallopian tube: March 2005InfundibulumAmpullaIsthmusInterstitium  <response>: Ans. B: Ampulla The vast majority of ectopic pregnancies implant in the Fallopian tube. Pregnancies can grow in the infundibulum 18 of all ectopics, the ampullary section 55, the isthmus 25, and the interstitial pa of the tube 20. Moality of a tubal pregnancy at the isthmus or within the uterus interstitial pregnancy is higher as there is increased vascularity that may result more likely in sudden major internal hemorrhage. 