Cornual pregnancy:

Sonography of the uterus shows a gestation sac of 6 weeks 4 days age, in the right cornu of the uterus. 3-D image of the uterus further confirms the findings. These ultrasound images are diagnostic of cornual pregnancy (a type of ectopic pregnancy). Ultrasound images courtesy of Dr. Latha Natrajan, Bangalore, India.

http://www.ultrasound-images.com/early-pregnancy.htm