Occasionally, GTD is complicated by hyperthyroidism, which may require treatment. This is thought to occur due to molecular mimicry between human chorionic gonadotrophin (HCG) and thyroid-stimulating hormone (TSH), and hence cross-reactivity with the TSH receptor.

Why does hydatidiform mole cause hyperthyroidism?

Clinical thyrotoxicosis is rare in molar pregnancy and has yet to be reported in a patient with a partial mole. Human chorionic gonadotropin (hCG), which has thyrotropic activity, is believed to be responsible for hyperthyroidism of gestational trophoblastic activity and hyperemesis gravidarum.

Why does hyperthyroidism occur in molar pregnancy?

5 In normal pregnancy, the elevated β-hCG concentration induces a weak hyperthyroid state. This is heightened in molar pregnancy due to higher concentrations of β-hCG.

How does a molar pregnancy affect the thyroid?

These results suggest that: 1) some patients with molar pregnancy display a marked elevation of serum T4, T3, and free T4 concentrations, probably as a result of the action of a thyroid stimulator which is closely related to serum hCG or may be hCG itself; 2) T4 production rates are increased in these patients, and the ...

How does molar pregnancy cause preeclampsia?

Molar pregnancy is associated with very early-onset preeclampsia. Since excessive circulating anti-angiogenic factors may play a pathogenic role in preeclampsia, we hypothesized that molar placentas produce more anti-angiogenic proteins than normal placentas.

Hyperthyroidism Overview (causes, pathophysiology)

32 related questions found

What is GTD in pregnancy?

Gestational trophoblastic disease (GTD) is a group of rare diseases in which abnormal trophoblast cells grow inside the uterus after conception. In gestational trophoblastic disease (GTD), a tumor develops inside the uterus from tissue that forms after conception (the joining of sperm and egg).

What causes bleeding in molar pregnancy?

One sign of persistent GTN is a high level of human chorionic gonadotropin (HCG) — a pregnancy hormone — after the molar pregnancy has been removed. In some cases, an invasive hydatidiform mole penetrates deep into the middle layer of the uterine wall, which causes vaginal bleeding.

Does hCG affect thyroid levels?

When the concentrations of hCG are very high (ie >200,000), as can be seen in the first trimester of pregnancy, it may actually turn on the thyroid gland and cause it to make extra thyroid hormone (thyroxine [T4] and triiodothyronine [T3]) which, in turn, may turn off the production of TSH from the pituitary.

What is hCG level for 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.

Can you naturally miscarry 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. You'll usually be given a general anaesthetic before the procedure, so you'll be asleep.

What is a twin molar pregnancy?

Twin molar pregnancy is a rare obstetric event, characterized by the coexistence of a hydatidiform mole and a potentially viable fetus with a normal placenta, associated with several pregnancy complications, such as spontaneous abortions, intrauterine deaths, preeclampsia, and hyperthyroidism, potentially leading to an ...

How is hydatidiform mole diagnosed?

Diagnosis of Hydatidiform Mole

They suspect a hydatidiform mole based on symptoms, such as a uterus that is much larger than expected and a vaginal discharge of grapelike tissue. A pregnancy test is done. If women have a hydatidiform mole, results are positive, but no fetal movement and no fetal heartbeat are detected.

Which finding is associated with thyroid storm?

People with thyroid storm generally exhibit an increased heart rate, as well as a high top blood pressure number (systolic blood pressure). A doctor will measure your thyroid hormone levels with a blood test. Thyroid stimulating hormone (TSH) levels tend to be low in hyperthyroidism and thyroid storm.

Is a partial molar pregnancy twins?

A foetus with a partial mole may survive when it occurs in a dizygotic twin, with one foetus and the other oocyte giving rise to a partial diploid mole, however, a monozygotic twin with triploidy gives rise to a partial mole with an abnormal foetus (16).

Can thyroxine cause skin problems?

The skin characteristics associated with thyroid hormone are classic. The name “myxedema” refers to the associated skin condition caused by increased glycosaminoglycan deposition in the skin. Generalized myxedema is still the classic cutaneous sign of hypothyroidism.

What is the choriocarcinoma?

(KOR-ee-oh-KAR-sih-NOH-muh) A malignant, fast-growing tumor that develops from trophoblastic cells (cells that help an embryo attach to the uterus and help form the placenta). Almost all choriocarcinomas form in the uterus after fertilization of an egg by a sperm, but a small number form in a testis or an ovary.

How is GTD diagnosed?

In addition to a physical examination, the following tests may be used to diagnose GTD:

1. Pelvic examination. ...
2. Human chorionic gonadotropin (hCG) test. ...
3. Other lab tests. ...
4. Ultrasound. ...
5. X-ray. ...
6. Computed tomography (CT or CAT) scan. ...
7. Magnetic resonance imaging (MRI).

Is there a heartbeat in molar pregnancy?

These include feeling nervous or tired, having a fast or irregular heartbeat, and sweating a lot. An uncomfortable feeling in the pelvis. Vaginal discharge of tissue that is shaped like grapes. This is usually a sign of molar pregnancy.

Can molar pregnancy be misdiagnosed?

Conclusion: Clinical and histopathologic diagnosis of twin molar pregnancies is inaccurate in many suspected cases; therefore, a second (expert) opinion should be sought. When the diagnosis is accurate, maternal and fetal complications are common.

Can hCG cause hyperthyroidism?

In conclusion, hCG has thyroid-stimulating activity that influences thyroid function early in pregnancy when hCG levels are high. Excessive hCG secretion may cause hyperthyroidism in patients with hyperemesis gravidarum or trophoblastic tumors.

Does hCG raise estrogen levels?

hCG stimulation also results in an increase in serum estrogens concentration and provides information on aromatizing activity within the testis (28–31).

What causes hCG levels to rise if not pregnant?

Although the most common cause of an elevated HCG level in females is pregnancy, occasionally, a HCG-secreting tumor is suspected and other conditions such as gestational trophoblastic disease (GTD), nontrophoblastic neoplasms, or a pituitary source of HCG, must be considered.

What are the risk factors to molar pregnancy?

The cause of molar pregnancy is unknown, but risk factors include:

• maternal age of less than 20 or more than 40 years.
• race – Asian women are at increased risk.
• dietary deficiencies including lack of folate, beta-carotene or protein.
• prior history of gestational trophoblastic disease – the recurrence rate is one in 100.

What are the two types of molar pregnancy?

There are two kinds of molar pregnancy:

• Complete molar pregnancy. In this condition, there's no embryo or placental tissue. ...
• Partial molar pregnancy. In this condition, there's an embryo and maybe some placental tissue.

How long do you bleed after molar pregnancy?

You will have some bleeding for up to 2 weeks and it might be heavy and red at first. Let your doctor or specialist nurse know if the bleeding doesn't ease off or if it gets heavier. For 2 weeks after the operation you should avoid: having sex.