Molar pregnancy is a rare entity and ectopic location of pregnancy in the uterine horn represents the least frequent site of implantation. This paper presents a rare case of molar cornual ectopic pregnancy at advanced gestational age with a particular difficulty in diagnosis and management. A 35-year-old woman, gravida 4 para 3 with a history of 12 weeks amenorrhea, was operated for presumed ruptured ectopic pregnancy. Per-operative findings showed swollen villi in clusters that looked like bunches of grapes, characteristic of a complete hydatiform mole, located at the left horn of the uterus. Histopathologic examination confirmed the diagnosis. Bleeding could not be controlled with sutur-ing and hysterectomy was eventually done. Although rare, molar pregnancy can be ectopic. If it is located at the uterine horn, bleeding may be difficult to control if at a gestational age of 12 weeks or more.