Modified Arias-Stella reaction in paratubal epithelium.

The Arias-Stella reaction (hyperplastic changes of the endometrial epithelium associated with cellular atypia) may be seen in uterine or extra-uterine pregnancies. I found a modified Arias-Stella reaction in paratubal epithelial cells. The fallopian tube studied was removed because of ruptured ectopic pregnancy. Although this phenomenon has not been previously reported, it is not really remarkable because of the embryological similarity of paratubal and endometrial epithelium.