Tubal pregnancy. Associated histopathology.

Endometrial histologic characteristics are of little value in predicting ectopic pregnancy. The growing tubal gestation does not have any unique characteristics as far as the maternal-fetal tissue interface is concerned. The placentation is relatively superficial, and the growth is intraluminal. Tubal rupture occurs as a result of progressive tubal distention with focal hemorrhagic necrosis. Persistence is a reflection of incomplete evacuation combined with the noncyclic shedding of the tubal epithelium. The evacuated implantation site and conservative surgical incisions are not directly related to the recurrence of ipsilateral tubal pregnancies. The most common histologic finding related to tubal pregnancy is that of prior tubal disease.