A Partial Hydatidiform Mole is a type of abnormal pregnancy that occurs when an egg is fertilized by two sperm cells or when an egg with two sets of chromosomes is fertilized. This results in an abnormal placenta that can develop cysts and may contain some fetal tissue. However, the fetus is usually not viable and cannot survive. Women with a partial hydatidiform mole may experience symptoms such as vaginal bleeding, an enlarged uterus, and high levels of pregnancy hormones. Diagnosis is typically made through ultrasound and blood tests. Treatment often involves monitoring and, if necessary, surgical removal of the abnormal tissue to prevent complications.