A hydatidiform mole is an abnormal conception with excessive trophoblasts development resulting in human pregnancy with cystic degeneration of chorionic villi. A complete hydatidiform mole is characterized by cystic swelling of all villi, diffuse trophoblastic hyperplasia, lack of fetal part and 46 chromosomes of paternal origin. A partial hydatidiform mole shows focal trophoblastic hyperplasia with identifiable embryonic or fetal tissues with triploid karyotype (69 chromosomes).
The simultaneous occurrence of a gestational trophoblastic neoplasia and a live fetus is a rare phenomenon, with an estimated incidence of 1 in 22,000 to 100,000 pregnancies. Ultrasonography has become a crucial tool in recent years for confirming the diagnosis of such entities. We experienced two cases of partial hydatidiform moles, and report these cases with a brief review of the literatures.