A hydatidiform mole is an abnormal pregnancy, in which there is hyperplastic development of the placenta, which often develops into a mass of small vesicles or cysts. The name “hydatidiform” refers to ...

This tissue normally develops into the placenta to support the pregnancy. Hydatidiform mole or "mole" is the term ... The most common form, also called a molar pregnancy, occurs when the sperm and egg ...