A case of abdominal pregnancy resulting from the rupture of the atresic horn of a bicornuate uterus and asymptomatic till the 23rd week of amenorrhea is reported. The peculiarities of this case lie in the advanced gestational age and in the association between two pathologies undoubtedly unusual as cornual and abdominal pregnancy. Discussion is focused on the limits of classical obstetrical semeiology, the possibilities of the instrumental examinations, the criteria that should guide decision-making and on the correct surgical management of this uncommon even if potentially life-threatening clinical pathology.