most common site of ectopic pregnancy
Most Common site: Ampulla. Most common site for rupture: Isthmus -because it has a thick muscularis, is narrow, inflexible and rigid. 97% of ectopic pregnancies occur in the Fallopian tube. 80% of these occur in the ampulla region of the tube. About 10% occur in the isthmus region and about 5% in the infundibulum region. Only about 3% occur in the interstitial portion of the Fallopian tube.