It is a rare but dangerous complication. It occurs when there is a problem in the sperm or ovum leading to formation of defected conceptus. There is complete mole where there is a placenta and no fetus caused by a sperm fertilizing an empty ovum. There is also an incomplete mole where there is a defected fetus and placenta due to a sperm fertilizing an ovum with abnormal number of chromosomes. Placenta grows very fast and in a deformed manner forming vesicles which looks like grapes and (HCG) hormone is released in blood in increased amounts leading to exaggerated pregnancy symptoms like nausea and vomiting. Immediate interaction is needed.
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