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gestational trophoblastic tumor (jeh-STAY-shuh-nul troh-fuh-BLAS-tik TOO-mer)
Any of a group of tumors that develops from trophoblastic cells (cells that help an embryo attach to the uterus and help form the placenta) after fertilization of an egg by a sperm. The two main types of gestational trophoblastic tumors are hydatidiform mole and choriocarcinoma. Also called gestational trophoblastic disease.