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The Daily Insight

Are molar pregnancies dangerous

Author

Nathan Sanders

Published Apr 18, 2026

If not treated, a molar pregnancy can be dangerous to the woman. It sometimes can cause a rare form of cancer. A molar pregnancy is a kind of gestational trophoblastic disease (also called GTD). This is a group of conditions that cause tumors to grow in the uterus.

How serious is a molar pregnancy?

A molar pregnancy can have serious complications — including a rare form of cancer — and requires early treatment.

What percent of molar pregnancies are cancerous?

Fewer than 15% of molar pregnancies become invasive and spread outside of the uterus. Choriocarcinoma. This is a cancerous tumor formed from trophoblast cells.

What happens if a molar pregnancy is not treated?

If a molar pregnancy is not treated or does not miscarry completely it can progress and cause a range of serious conditions (known as gestational trophoblastic neoplasia), including: persistent GTD – persistent growth of the abnormal placental tissue. invasive mole – the tumour spreads into the wall of the uterus.

Can a baby survive a molar pregnancy?

A molar pregnancy will not be able to survive. It may end on its own, with a miscarriage. If this does not happen, it’s usually treated with a procedure to remove the pregnancy.

How soon after a molar pregnancy Can you try again?

The risk of having another molar pregnancy is small (about 1 in 80). It’s best not to try getting pregnant again until all your follow-up treatment has finished. For most women, this will take about 6 months. If you have GTN, you will need to wait for 12 months after you have finished chemotherapy treatment.

Can you naturally miscarry a molar pregnancy?

Some molar pregnancies will miscarry without intervention, but if doctors detect molar pregnancy by ultrasound, they usually recommend a D&C or medication in order to reduce the risk of further complications. Surgery can usually remove most complete and partial moles.

How do they remove a molar pregnancy?

To prevent complications, the abnormal placental tissue must be removed. Treatment usually consists of one or more of the following steps: Dilation and curettage (D&C). To treat a molar pregnancy, your doctor will remove the molar tissue from your uterus with a procedure called dilation and curettage ( D&C ).

Has anyone had a molar pregnancy?

The answer was yes, it was a pregnancy – but there was no baby, just a mass of ugly cells. Molar pregnancies, as they are called, are rare, affecting around 1,500 women in the UK each year.

Why do molar pregnancies happen?

What causes a molar pregnancy? Molar pregnancies result when specific genetic errors occur during the fertilization of an egg by a sperm. In a healthy pregnancy, a placenta forms to nourish the growing embryo. With a molar pregnancy, instead of a placenta, a tumor forms inside the uterus.

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Is molar pregnancy a tumor?

A molar pregnancy contains many cysts (sacs of fluid). It is usually benign (not cancer) but it may spread to nearby tissues (invasive mole). It may also become a malignant tumor called choriocarcinoma.

How high is hCG molar pregnancy?

The measurement of high hCG levels in excess of 100,000 mIU/mL suggests the diagnosis of a complete molar pregnancy, particularly when associated with vaginal bleeding, uterine enlargement and abnormal ultrasound findings.

What type of chemotherapy is used for molar pregnancy?

You have treatment with methotrexate as low risk chemotherapy if you have PTD after a molar pregnancy. You have the methotrexate as an injection into a muscle (intramuscularly) every other day. This is usually into one of the large muscles in your leg or your bottom (buttock).

Why do you have to wait a year after molar pregnancy?

The risk of GTD coming back is highest in the first few months. You will need to wait a year after finishing your treatment before you try and get pregnant again, if you have chemotherapy . It’s important to know that having a GTD does not increase your risk of having a baby with abnormalities.

How long does it take for hCG levels to drop after partial molar pregnancy?

In most women, the hCG level virtually disappears within 4 to 6 weeks of removing the molar pregnancy.

What happens if I get pregnant after molar pregnancy?

They usually do this about 6 to 8 weeks after any pregnancy, including miscarriage. Most women (more than 98%) who become pregnant after a molar pregnancy will not have another molar pregnancy. There is also no increased risk of complications in future pregnancies.

What is considered a high hCG level at 5 weeks?

hCG levels at 5 weeks should be about 19 to 7,340 mIU/mL. As you can see, it’s a big increase from week 4! And it just keeps getting bigger. hCG levels at 6 weeks will increase to around 1,080 to 56,500 mIU/mL.

Can you see a molar pregnancy on ultrasound at 6 weeks?

An ultrasound can detect a complete molar pregnancy as early as eight or nine weeks of pregnancy.

Do all molar pregnancies need chemo?

Afterwards, in around 15 out of 100 women (around 15%) some molar tissue remains in the deeper tissues of the womb or other parts of the body. This is called a persistent gestational tumour. These women need to have chemotherapy, which can completely get rid of the abnormal cells.

How long is chemo for molar pregnancy?

A course of chemotherapy treatment usually lasts 3–6 months, depending on the type of drug and stage of cancer. Doctors typically administer chemotherapy in cycles, with rest periods between 1–4 weeks.

Is trophoblastic disease curable?

Persistent trophoblastic disease can spread to other parts of the body like a cancer but it has a cure rate of nearly 100%. The treatment for persistent trophoblastic disease is usually chemotherapy.