Trophoblastic Disease(Hydatidiform Mole)
What is Trophoblastic Disease?
Trophoblastic Disease (also called a Hydatidiform Mole) is when the layer of cells that line the gestational sac convert to a mass of clear vesicles instead of a healthy placenta. Without the placenta, the fertilized egg deteriorates. It is believed that this is caused by a chromosomal abnormality in the fertilized egg. Roughly 1 in 2,000 pregnancies in the USA are affected, and it occurs more frequently in women over 45 years old than in younger women.
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The first sign is usually an intermittent or continuous browninsh discharge. 
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