Molar pregnancy

**Definition:** A condition caused by the over-production of cells arising into the placenta during pregnancy. This condition is characterised by a pregnancy with abnormal placental growth in which the chorionic villi become hydropic, trophoblast proliferation and invasion of the uterine tissue within 10-16 weeks after conception, and a placental mass.

**Exclusions:** - malignant hydatidiform mole