A rare type of ectopic pregnancy (found in about 2% to 4% of all ectopic pregnancies) in which implantation takes place in one of the horns of the uterus. The uterine horn may rupture between the 12th and 16th week of gestation, causing life-threatening shock. Traditionally, cornual pregnancies have been managed with laparotomy and hysterectomy, although conservative management strategies are employed occasionally.