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How is the most common type of gestational trophoblastic tumor classified?

Hydatidiform moles, the most common type of gestational trophoblastic tumor (GTT), are classified as either partial or complete. Complete hydatidiform moles are formed by one or two sperm fertilizing a defective egg that contains no genetic material. No normal fetal or placental tissue is formed, and a thick placenta consisting of cysts develops inside the uterus.

Partial hydatidiform moles are formed when two sperm fertilize a normal egg. In this case, there will be some fetal tissue formed, but the fetus is so abnormal that it cannot survive. There may be a small amount of normal placenta and amniotic fluid formed, but an abnormally thick placenta generally develops.

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