Gestational trophoblastic disease (GTD) is a group of rare tumors that involve abnormal growth of trophoblast cells, which normally develop into the placenta during pregnancy. One aggressive form is choriocarcinoma, a malignant tumor that can spread quickly but responds well to treatment.
Types of GTD include:
• Hydatidiform mole (complete or partial molar pregnancy)
• Invasive mole
• Choriocarcinoma
• Placental-site trophoblastic tumor (PSTT)