Hydatidiform mole (HM) is an irregular growth that forms inside the womb (uterus) at the beginning of a pregnancy. It's a type of gestational trophoblastic disease (GTD).
Hydatidiform mole or molar pregnancy, causes from abnormal fertilization of the oocyte (egg). It results in an abnormal fetus. The growth of placenta is normal with little or no growth of the fetal tissue. This forms a mass in the uterus. This mass is like a grape-like appearance, as it contains many small cysts when Ultrasound scan is done.
Chances of mole formation is higher in older women.
Molar pregnancy can be of two types:
Partial molar pregnancy: In this there is an abnormal placenta and some fetal development.
Complete molar pregnancy: In this there is an abnormal placenta and no fetus.