Embarazo heterotópico espontáneo en pacientes con antecedente de embarazo gemelar familiar: 2 casos

Heterotopic pregnancy is the coexistence of an intrauterine pregnancy with an extrauterine pregnancy. There are two types: induced (associated with in vitro fertilization techniques, representing 1:1000 to 1:1,500 pregnancies) or spontaneous (1: 20,000 to 1: 80.000 pregnancies). Causal factors for spontaneous heterotopic pregnancies include pelvic inflammatory disease, use of hormonal or intrauterine devices, previous pelvic surgery and ectopic pregnancy. We report two cases of spontaneous heterotopic pregnancy in patients with a family history of twins.