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Molar Pregnancy
A molar pregnancy refers to a pregnancy that is a type of gestational
trophoblastic disease. It can refer to either a complete or a partial
mole. Throughout the United States and Europe the incidence is about
1/1000 and 1/2000 pregnancies. Although it is much more common in areas
such as Southeast Asia and Mexico.
We still do not know exactly why a molar pregnancy occurs. It is believed
to be a nutritional deficit like protein or carotene. It can also be
caused by a ovular (ovulation) defect.
Complete Mole
This occurs when the nucleus of an egg is either lost
or inactivated. The sperm then duplicates itself because the egg was
lacking genetic information. Usually there is no fetus, no placenta, no
fluid and no amniotic membranes.
The uterus is rather filled with the mole that resembles a bunch of
grapes. The fluid filled vesicles grow rapidly, which can make the uterus
seem larger than it should be for gestational age. Because there is no
placenta to receive the blood typically you will see bleeding into the
uterine cavity or vaginal bleeding.
Partial Mole
This most frequently occurs when two sperm fertilize
the same egg. There may be partial placentas, membranes or even a fetus
present in a partial mole. However, there are usually genetic problems
with the baby. Rarely, a partial mole will exist with twin pregnancy,
however, the other twin rarely survives.
Symptoms
Symptoms include:
* Increased nausea and vomiting
* Vaginal bleeding
* Increased hCG levels
* Rapidly growing uterus
* Pregnancy induced hypertension prior to 24 weeks
* No fetal movement or heart tone detected
* Hyperthyroidism
* Pulmonary Embolization.
Diagnosis
Most of the time a molar pregnancy will spontaneously
end. When the woman passes tissues that appear to be grape like and shows
them to her practitioner then a molar pregnancy is suspected.
Ultrasound can also help determine a molar pregnancy. When doing an
ultrasound one sees a “snow storm effect" on the screen.
Serial hCG levels can show a rapid rise in hCG that may indicate that
further study is needed.
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