A hydatidiform mole is an abnormal pregnancy ... time it is clinically diagnosed, but in a partial hydatidiform mole there may be an embryo or fetus. The most common form, complete hydatidiform moles ...

A molar pregnancy is usually caused by abnormalities in the chromosomes that can come in the way of the embryo's development, and lead to the growth of a tumour, says the expert. For instance ...

She was then diagnosed with a partial molar pregnancy with a co-existing twin - where the egg is fertilised by two sperm ...