This document discusses hydatidiform mole, a rare abnormal pregnancy characterized by an abnormal placenta. There are two types - complete and partial mole. Complete mole has no fetal tissue and an enlarged uterus, while partial mole has some normal placental tissue and a non-viable fetus. Risk factors include maternal age and previous molar pregnancy. Symptoms include vaginal bleeding, nausea, and rapid uterine growth. Diagnosis involves ultrasound, HCG levels, and histological examination of tissue. Treatment is usually suction evacuation of the uterus, with follow up to monitor for complications like hemorrhage and sepsis.