ABSTRACT
The last three are grouped together under the category ‘gestational trophoblastic tumours’ (GTTs). GTD is rare in the UK with an incidence of 1.54 per 1000 live births. It does occur more commonly in many parts of Asia, Africa and Latin America. CHM occurs more commonly in women <16 years or >40 years. The incidence of PHM is not related to age at conception. There is an increased risk of hydatidiform mole in women with a previous molar pregnancy.
