An aggressive malignant tumor arising from trophoblastic cells in the uterus during pregnancy. Approximately half of the cases develop from a complete hydatidiform mole. There is often marked elevation of human chorionic gonadotropin (hCG) in the blood. Choriocarcinomas disseminate rapidly through the hematogenous route; the lungs are most frequently affected. The disease is uterine corpus choriocarcinoma (Monarch Disease Ontology term MONDO_0004491). Also known as: body of uterus choriocarcinoma (disease), body of uterus gestational choriocarcinoma, gestational choriocarcinoma of body of uterus, gestational uterine corpus choriocarcinoma, uterine corpus gestational choriocarcinoma.