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A molar pregnancy, also known as a hydatidiform mole, is an abnormal form of pregnancy in which a non-viable fertilized egg implants in the uterus. Learn about the possible causes, types and symptoms of this condition, as well as the risks of complications and treatment options. Overview A molar pregnancy is a rare complication of pregnancy. It involves unusual growth of cells called trophoblasts. These cells typically become the organ that feeds a growing fetus. That organ also is known as the placenta. There are two types of molar pregnancy — complete molar pregnancy and partial molar pregnancy. In a complete molar pregnancy, the placental tissue swells and appears to form fluid-filled cysts. There is no fetus. Hydatidiform moles are abnormal placentas with variable trophoblastic proliferation and villous hydrops If this happens, abnormal cells may grow into the muscle layer around your uterus (also called an invasive mole). This is rare and happens in less than 15% of people who’ve had a molar pregnancy removed.
