Definition

A gestational trophoblastic tumor (GTT) is a rare cancer that develops in tissues formed when a sperm fertilizes an egg but does not create a fetus.

Description

Also known as gestational trophoblastic neoplasms (GTN), these highly curable malignancies originate inside the uterus, in cells (trophoblasts) that make up one layer of the placenta. The most common types of GTT are hydatidiform mole (molar pregnancy) and choriocarcinoma. Placental-site trophoblastic tumor is an extremely rare type of GTT. It originates at the place where the placenta was attached to the wall of the uterus.

Hydatidiform mole

A hydatidiform...