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Advanced abdominal pregnancy in a spontaneous heterotopic pregnancy. 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 as the form of the ectopic component, outside the context of assisted reproduction, is an even more unusual and perilous diagnosis with very few cases reported in the literature. We report such a case in a 34-year-old multipara, with no known risk factors for ectopic pregnancy. The pregnancy was initially misdiagnosed and managed as a dichorionic gestation, complicated with fetal demise of one of the twins. The correct diagnosis was only made after term delivery of the intrauterine pregnancy. The abdominal pregnancy was subsequently managed via laparotomy with no complications.