Gestational trophoblastic disease (GTD) is a group of rare tumors that develop from the cells that normally form the placenta during pregnancy. It includes conditions like molar pregnancy, where abnormal tissue grows instead of a healthy embryo. GTD can lead to complications if not diagnosed and treated early. The main types of GTD are complete mole, partial mole, and choriocarcinoma. Symptoms may include abnormal bleeding, enlarged uterus, and high levels of human chorionic gonadotropin (hCG) in the blood. Treatment often involves surgery and monitoring hCG levels to ensure the disease does not return.