Two main risk factors increase the likelihood for the development of<unk> : 1) The woman being under 20 years of age, or over 35 years of age, and 2) previous<unk> . Although molar pregnancies affect women of all ages, women under 16 and over 45 years of age have an increased risk of developing a molar pregnancy.Being from Asia/of Asian ethnicity is an important risk factor. Hydatidiform moles are abnormal conceptions with excessive placental development. Conception takes place, but placental tissue grows very fast, rather than supporting the growth of a fetus. Complete hydatidiform moles have no fetal tissue and no maternal DNA, as a result of a maternal ovum with no functional DNA. Most commonly, a single spermatozoon duplicates and fertilises an empty ovum. Less commonly, two separate spermatozoa fertilise an empty ovum (dispermic fertilisation). Partial hydatidiform moles have a fetus or fetal cells. They are triploid in origin, containing one set of maternal haploid genes and two sets of paternal haploid genes. They almost always occur following dispermic fertilisation of a normal ovum. Malignant forms of<unk>  are very rare. About 50% of malignant forms of<unk>  develop from a hydatidiform mole.
Gestational trophoblastic disease
Forced pregnancy
Toxic abortion
Postpartum infections
Early pregnancy bleeding
After-birth abortion
Molar pregnancy
Puppy pregnancy syndrome