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What causes a molar pregnancy?

A molar pregnancy occurs because at conception the embryo develops with an extra set of chromosomes from the father. Why this occurs is not known. In a normal embryo, cells contain one set of chromosomes from the mother and one set from the father. In a molar pregnancy, more than one set of chromosomes come from the father, either because the chromosomes from one sperm have been duplicated, or because two separate sperm have fertilized the mother's egg. A complete molar pregnancy occurs when the egg contains no chromosomes, whereas in a partial molar pregnancy the egg contain the normal 23 chromosomes.

FAQ Frequently asked questions

What is a molar pregnancy?

A molar pregnancy occurs when the placenta develops abnormally, forming a mass of tissue (known as a mole) inside the uterus. It is sometimes also known as a hydatidiform mole.

What are the symptoms of a molar pregnancy?

A molar pregnancy is usually detected early in a pregnancy. It often ends in a miscarriage and is not able to form a viable pregnancy. Symptoms include: vaginal bleeding during the first three months of pregnancy; growth of the uterus that does …

Who can have a molar pregnancy?

Molar pregnancy is not common. However, women may be at an increased risk of having a molar pregnancy if they: are of Asian descent; are under 20 or over 40 years of age, or; have a history of previous gestational trophoblastic disease (including molar …

How is a molar pregnancy diagnosed?

In some cases, a molar pregnancy will be detected as part of a routine ultrasound during early pregnancy. Your doctor will ask you about your symptoms and your medical history. They may ask questions about any previous pregnancies, births, miscarriages …

How is a molar pregnancy treated?

In most cases, the main treatment for molar pregnancy is to remove the abnormal placental tissue. Treatments that may be recommended include: evacuation of the uterine contents, and; hysterectomy (which may be an option for older women who do not want any …

Are there different types of a molar pregnancy?

Molar pregnancies can be either complete, in which there is only abnormal placental tissue (and no fetus), or partial, in which there is an abnormal fetus and sometimes some normal placental tissue.

What is the outlook for a molar pregnancy?

In most cases, treatment of a molar pregnancy by evacuation of the uterus is successful. Most women can have normal pregnancies in the future, although there is about a one in 100 chance of having another molar pregnancy. Having regular check-ups …

Is a molar pregnancy serious?

While a molar pregnancy can usually be removed successfully and without any complications, ending a pregnancy can still be distressing. Speaking to your doctor or a mental health professional can help. Counselling services may be available at your hospital. If …

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About this article

Author: Dr Bow Tauro PhD, BSc (Hons)
First answered: 07 Nov 2014
Last reviewed: 19 May 2018
Rating: 4.3 out of 5
Votes: 366 (Click smiley face below to rate)
Category: Miscarriage

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