Recurrent Hydatidiform Mole - An Overview

Introduction

Recurrent hydatidiform mole is a disorder that affects women and is defined by the presence of at least two abnormal pregnancies that result in the production of hydatidiform moles. A hydatidiform mole is a mass formed early in pregnancy and composed of cells from an improperly developing embryo and placenta. Normally, the embryo would develop into a fetus, and the placenta would expand to feed the growing fetus. A hydatidiform mole that appears once is known as sporadic hydatidiform mole; if it occurs repeatedly, the condition is known as recurrent hydatidiform mole.

What Is Recurrent Hydatidiform Mole?

Hydatidiform mole is a rare type of human pregnancy distinguished by faulty embryonic development and excessive trophoblast growth. It happens once in every 600 to 1000 pregnancies. Among women with one hydatidiform mole (sporadic hydatidiform mole), approximately one to nine percent develop a second mole (recurrent hydatidiform moles). Hydatidiform moles are categorized histologically as either whole or partial. Complete hydatidiform moles feature strong circumferential trophoblastic proliferation and, in general, lack embryonic tissues. Partial hydatidiform moles have moderate localized trophoblastic growth and may contain embryonic tissue. Genotypically, complete hydatidiform moles are generally diploid androgenetic (both chromosomal complements are of paternal origin), whereas partial hydatidiform moles are mostly triploid dispermic.

What Are the Other Names for This?

• Familial recurrent hydatidiform mole.

• Recurrent androgenetic hydatidiform mole.

• Recurrent biparental hydatidiform mole.

• Molar pregnancy.

What Are the Causes of Recurrent Hydatidiform Mole?

• A molar pregnancy results from an abnormally fertilized egg. Human cells typically have 23 pairs of chromosomes. In a typical fertilization, one chromosome in each pair comes from the father and the other from the mother.

• In a full molar pregnancy, one or two sperm fertilize the egg. The chromosomes from the mother's egg are absent or dysfunctional. The father's chromosomes are copied. There is none from the mother.

• A partial or fragmentary molar pregnancy has the mother's chromosome but the male provides two sets of chromosomes.

• The embryo then has 69 chromosomes rather than 46. This typically occurs when two sperm fertilize an egg, resulting in an additional copy of the father's genes.

What Are the Symptoms of Recurrent Hydatidiform Mole?

Initially, a molar pregnancy may appear to be a normal pregnancy. However, most molar pregnancies produce symptoms that may include:

• During the first three months, vaginal bleeding ranges from dark brown to brilliant crimson.

• Severe nausea and vomiting.

• Sometimes grape-like cysts pass from the vagina.

• Pelvic pressure or pain.

The majority of molar pregnancies are discovered within the first trimester thanks to improved methods of detection. If not discovered within the first three months, indications of a molar pregnancy may include:

• A uterus expands rapidly and becomes excessively big early in the pregnancy.

• Preeclampsia is a disorder that causes high blood pressure and protein in urine before 20 weeks of pregnancy.

• Ovarian cysts.

• Overactive thyroid, commonly known as hyperthyroidism.

What Are the Risk Factors of Recurrent Hydatidiform Mole?

A molar pregnancy can be caused by several factors, including:

• Early Molar Pregnancy: If one has had a molar pregnancy before, one is more likely to have another. A recurrent molar pregnancy occurs in around one out of every hundred persons.

• Age of the Mother: A molar pregnancy is more common in adults over the age of 43 and under the age of 15.

What Are the Complications of Recurrent Hydatidiform Mole?

• After a hydatidiform carcinoma is removed, molar tissue may remain and multiply. GTN stands for chronic gestational trophoblastic neoplasia. GTN is more prevalent in whole molar pregnancies than partial molar pregnancies. A high level of human chorionic gonadotropin (HCG), a pregnancy hormone, after the molar embryo has been eliminated is one symptom of chronic GTN. In some circumstances, the molar pregnancy-causing mole enters the uterine wall's middle layer. This leads to vaginal bleeding.

• Chemotherapy is commonly used to treat persistent GTN. Another therapeutic option is uterine removal, often known as a hysterectomy.

• Choriocarcinoma, a malignant type of GTN, arises on rare occasions and spreads to other organs. Choriocarcinoma is typically treated satisfactorily with chemotherapy.This problem is more prevalent in whole molar pregnancies than in partial molar ones.

What Is the Diagnosis of Recurrent Hydatidiform Mole?

A healthcare professional who suspects a molar pregnancy will most likely order blood tests and an ultrasound. During early pregnancy, a sonogram may include inserting a wand-like equipment into the vagina.

As early as eight or nine weeks of pregnancy, an ultrasound of a full molar pregnancy may show:

• No embryos or fetuses.

• No amniotic fluid.

• A massive cystic placenta that nearly fills the uterus and ovarian cysts.

An ultrasound of a partly molar pregnancy may show:

• A fetus is smaller than predicted.

• Low amniotic fluid.

• Placenta that seems weird.

After discovering a molar pregnancy, a healthcare professional may look for underlying medical concerns, such as:

• Preeclampsia.

• Hyperthyroidism.

• Anemia.

What Is the Treatment of Recurrent Hydatidiform Mole?

A molar pregnancy must be permitted to continue. To avoid difficulties, the damaged placental tissue should be removed. Treatment usually involves one or more of the following steps:

1. Dilation and Curettage:

• This treatment eliminates molar tissue from the uterus. One lies back on a table, legs in stirrups. One is given drugs to dull you or put you to sleep.

• After opening the cervix, the clinician uses a suction instrument to remove the uterine tissue. A D and C for a molar pregnancy is usually performed at a hospital or surgery center.

2. Uterine Removal:

• This happens seldom if there is a higher risk of gestational trophoblastic neoplasia (GTN) and no desire for future pregnancies.

• Human chorionic gonadotropin monitoring. After the molar tissue is removed, a provider monitors the HCG level until it decreases. If the level of HCG in the blood remains high, further therapy may be required.

• After treatment for the molar pregnancy is completed, a physician may monitor HCG levels for six months to ensure that no molar tissue remains. HCG levels in GTN patients are monitored for a year after chemotherapy is done.

• Because pregnancy HCG levels grow throughout a normal pregnancy, a provider may advise waiting 6 to 12 months before attempting to conceive again. During this period, the provider might offer a reliable method of birth control.

Conclusion

A hydatidiform mole is the most frequent form of a related set of lesions caused by abnormal placental trophoblast growth, known as gestational trophoblastic disease. After a sperm fertilizes an egg, trophoblastic cells (cells that help an embryo connect to the uterus and create the placenta) develop into a slow-growing tumor. A hydatidiform mole has many cysts (fluid-filled sacs). It is often benign (not cancerous), although it can spread to adjacent tissues (invasive mole). It may also develop into a malignant tumor known as choriocarcinoma. Hydatidiform mole is the most common type of gestational trophoblastic malignancy. Also known as molar pregnancy.