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In rare cases, a pregnancy does not progress normally and may form a hydatidiform mole (molar pregnancy). These pregnancies can lack an embryo (embryoblast) and have abnormal trophoblast tissue. The body often aborts hydatidiform moles naturally (spontaneous abortion or miscarriage). If they do not abort naturally, they can cause vaginal bleeding. In these cases, women will need a procedure to remove the trophoblast tissue from the uterus. Any trophoblast tissue left behind in the uterus after a hydatidiform mole is lost naturally or removed may develop into gestational trophoblastic disease (GTD).
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