A case of twin pregnancy with complete hydatidiform mole and coexisting fetus following IVF-ET.

Twin pregnancy consisting of complete hydatidiform mole (H-mole) and a coexisting fetus occurs with an estimated incidence of 1 per 22,000-100,000 pregnancies. The incidence of this unusual twin pregnancy with complete H-mole and a coexisting fetus after in vitro fertilization and embryo transfer (IVF-ET) is not thought to be greater than that of general population. We present an unusual twin pregnancy with complete H-mole and a coexisting fetus that occurred following IVF-ET, which was terminated at 21 weeks of gestation and developed into nonmetastatic gestational trophoblastic tumor.