this case is what we call an ectopic "cornual" pregnancy. As you may know, ectopic pregnancies occur when a fertilized egg implants itself somewhere other than the endometrial canal within the uterus. Fallopian tubes are the most common site, but here we see that the egg has implanted into the cornu of the uterus. Cornu comes from Latin meaning "horn" and is basically the area at the top/sides where the tubes and ovaries attach. The first pic shows it embedded in the cornu of the uterus, which is separate from the endometrial canal (yellow). 2nd pic shows close up of a growing embryo!