<prompt> Earliest ectopic to undergo rupture is:InterstitialIsthmicAinpullaryOvarian  <response>: Ans: b Isthmic Ref: D 6th ed, p. 181Ibbal ruptureMost common in isthmic regionIsthmic rupture - 6-8 wksAmpullary rupture -8-12 wksInterstitial rupture - 16 wksEctopic pregnancyCommonest site - AmpullaCommonest cause - PID Salpingitis due to STDCommonest mode of termination of tubal pregnancy -Tubal abortionArias-Stella reaction - typical adenomatous change of endometrial glands seen in ectopic pregnancy. 