MSFinals-3223

A 35-year-old pregnant woman attends the Obstetric clinic for a routine early pregnancy scan. She has been struggling so far during the pregnancy, suffering from extreme, persistent nausea and vomiting. On the ultrasound scan, the image observed resembles ‘a snow storm’. The physician is concerned that this may be a complete molar pregnancy.
What percentage of complete molar pregnancies go on to become invasive?