BACKGROUND: Gestational trophoblastic neoplasia (GTN) represents a spectrum of premalignant and malignant diseases that occur after abnormal fertilization. [1] GTN includes complete hydatidiform mole (CHM), partial hydatidiform mole (PHM), invasive mole, choriocarcinoma, and placental-site trophoblastic tumor (PSTT). CHM and PHM together account for 80% of all cases of GTN.