Ectopic (tubal) pregnancy

Ectopic (tubal) pregnancy • The black arrow points to villi within the fallopian tube lumen. • The stroma is loose and the trophoblast layer is thick, typical of first trimester. • The blue arrow points to a syncytiotrophoblast. • The lower right corner is the decidualized tubal stroma. (Description By:Melinda Sanders, M.D. ) (Image Contrib. by:Melinda Sanders, M.D. UCHC )