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choriocarcinoma (kor″e-o-kahr″sĭ-no´mә)   a malignant neoplasm of trophoblastic cells formed by abnormal proliferation of the placental epithelium, without production of chorionic villi. It is a malignant variant of gestational thromboplastic disease and can occur following a full term pregnancy, pregnancy complicated by a mole, ectopic pregnancy, or abortion.

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