Dark brown to bright red vaginal bleeding during the first trimester, severe nausea and vomiting, sometimes vaginal passage of grapelike cysts, Pelvic pressure or pain. This is called persistent gestational trophoblastic neoplasia (GTN). This occurs in about 15% to 20% of complete molar pregnancies, and up to 5% of partial molar pregnancies.
A molar pregnancy is caused by an abnormally fertilized egg. Human cells normally contain 23 pairs of chromosomes. One chromosome in each pair comes from the father, the other from the mother. There is no way to prevent a molar pregnancy. If you have had a previous molar pregnancy, you can reduce your likelihood of complications by avoiding another pregnancy for one year after your initial molar pregnancy.
Approximately 1 in every 1,000 pregnancies is diagnosed as a molar pregnancy. Various factors are associated with molar pregnancy, including:
- Maternal age.A molar pregnancy is more likely in women older than age 35 or younger than age 20.
- Previous molar pregnancy.If you've had one molar pregnancy, you're more likely to have another. A repeat molar pregnancy happens, on average, in 1 out of every 100 women.
