Tubal ectopic pregnancy associated with an adenomatoid tumor

We present a case of coexistence of an ectopic pregnancy and an adenomatoid tumor in the same fallopian tube. The adenomatoid tumor is the most common benign neoplasm of the fallopian tube, and the vast majority of ectopic pr egnancies occur in the fallopian tube. However, coexistence of these two co nditions is extremely rare, and there has been only one previously reported case in the English literature. In the present case, the placental tissue, consisting of chorionic villi and decidua, was present in the ampulla, and the adenomatoid tumor was found in the myosalpinx, just proximal to the im plantation site, replacing a large part of the myosalpinx. The close spatia l relationship of these two lesions suggests that an adenomatoid tumor coul d have interfered with transportation of the fertilized ovum through the tu be, possibly via impaired contractile activity of the myosalpinx, and conse quently caused the ectopic tubal pregnancy.