In a molar pregnancy the fertilisation of the egg by the sperm goes wrong and creates abnormal cells or clusters of water filled sacs inside the womb. It is also called a hydatidiform mole.
Find out about the causes and risk factors for molar pregnancy.
Read about the possible symptoms of molar pregnancy and when you need to see a doctor.
Staging is a system that doctors use to describe the size of a tumour and whether it has spread.
Find out about survival for molar pregnancy.
Many molar pregnancies are picked up during routine ultrasound scans during pregnancy.
Find out about treatments for molar pregancy.
What you can do, who can help and how to cope with a diagnosis of gestational trophoblastic disease (GTD).