RESUMEN
Spontaneous heterotopic pregnancy is a potentially life-threatening condition rarely considered when a patient with an intrauterine pregnancy is asymptomatic or presents with complaints such as abdominal pain. An advanced abdominal pregnancy is even more unusual as the form of the ectopic component outside the context of assisted reproduction and is difficult in diagnosis with very few cases reported in the literature. We report such a case in a 31-year-old primigravida with heterotopic pregnancy which is a fetus in the uterine cavity and the other in the abdominal cavity. Her pregnancy was initially misdiagnosed and managed as a di-amniotic di-chorionic gestation. The correct diagnosis was only made after term delivery of the intrauterine pregnancy. The patient was complicated with severe bleeding which led to disseminated intravascular coagulopathy and massive transfusion. Two other operations were imposed on the patient because of bleeding. The clinical risk factor for ectopic pregnancy was only previous pelvic inflammatory disease in this woman.