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قديم 04-24-2012, 02:58 AM   #1
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تاريخ التسجيل: Aug 2011
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Arrow What is a molar pregnancy


What is a molar pregnancy?

A molar pregnancy happens when a fertilized egg develops into a growth called a mole instead of into a normal embryo. You may still have typical pregnancy symptoms in the beginning. But eventually you'll have bleeding and other symptoms that indicate something is wrong.

It can be scary and sad to lose a pregnancy this way. But as long as you get proper treatment, you're unlikely to have any long-term physical consequences.

How common are molar pregnancies?

About 1 in 1,500 pregnancies in the United States is a molar pregnancy. If you're under age 20 or over age 35, or if you've had a previous molar pregnancy, or two or more miscarriages, your chances of having a molar pregnancy are higher. Women of Southeast Asian descent also seem to have a higher risk of molar pregnancy.

What causes a molar pregnancy?

A molar pregnancy happens when there are certain problems with the genetic information (the chromosomes) in the fertilized egg at conception. The result is that the egg may develop into a growth with no embryo (this is called a complete mole) or an abnormal embryo (a partial mole).

In normal pregnancies, the fertilized egg contains 23 chromosomes from the father and 23 from the mother. This isn't the case with a molar pregnancy.

In most complete molar pregnancies, the fertilized egg contains two copies of the chromosomes from the father and none from the mother. In this case, there's no embryo, amniotic sac, or any normal placental tissue. Instead, the placenta forms a mass of cysts that looks like a cluster of grapes.

In most partial molar pregnancies, the fertilized egg has the normal set of chromosomes from the mother and two sets from the father, so there are 69 chromosomes instead of the normal 46. (This can happen when chromosomes from the sperm are duplicated or when two sperm fertilize the same egg.)

In a partial molar pregnancy, there's some normal placental tissue among the cluster of abnormal tissue. The embryo does begin to develop, so there may be a fetus or just some fetal tissue or an amniotic sac. But even if a fetus is present, in most cases it's so abnormal that it can't survive.

How would I know if I had a molar pregnancy?

Early on, you might have typical pregnancy symptoms, but at some point you'll begin to have some spotting or heavier bleeding. It might be bright red or a brownish discharge, continuous or intermittent, light or heavy. This bleeding could start as early as six weeks into your pregnancy or as late as 12 weeks.

You might also have severe nausea and vomiting, abdominal cramping, and abdominal swelling (because your uterus may grow more rapidly than usual).

Some women develop preeclampsia before midpregnancy if they have an undiagnosed molar pregnancy. However, because ultrasound helps practitioners diagnose molar pregnancies earlier these days, it's rare to carry one long enough for this condition to develop.

Call your doctor or midwife right away if you have any spotting or bleeding during your pregnancy. These symptoms don't necessarily signal a molar pregnancy, but your practitioner will probably order an ultrasound to find out what's causing them and may do a blood test to measure your levels of the hormone hCG. If you do have a molar pregnancy, the ultrasound will show cysts that look like a cluster of grapes in your uterus, and your levels of hCG will be higher than normal

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What is a molar pregnancy
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