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Hyperthyroidism II: Pathophysiology

Hyperthyroidism II: Pathophysiology

Hyperthyroidism is a hypermetabolic state caused by elevated levels of thyroid hormones, triiodothyronine (T3) and thyroxine (T4). It results from dysregulation at the thyroid, pituitary, or immune system level and affects multiple organ systems.PathophysiologyThe most common cause of hyperthyroidism is Graves’ disease, an autoimmune disorder in which antibodies, specifically thyroid-stimulating antibodies (TSAb), a subtype of TSH receptor antibodies (TRAb), bind to and activate TSH receptors...

Hyperthyroidism I: Introduction

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Hyperthyroidism is a type of thyrotoxicosis characterized by the thyroid gland's overproduction of the thyroid hormones triiodothyronine (T3) and thyroxine (T4). This hormone excess increases the basal metabolic rate and enhances sensitivity to catecholamines.DiagnosisDiagnosis is based on clinical features and biochemical testing. It typically shows suppressed thyroid-stimulating hormone (TSH) levels below 0.4 mIU/L, with elevated free T3 and/or T4. Additional tests, including thyroid...

Goiter

Goiter

Goiter refers to an abnormal enlargement of the thyroid gland that may appear as a diffuse goiter (uniform enlargement) or nodular (single or multiple nodules). Functionally, it is classified as nontoxic (normal/low hormone levels) or toxic (excess hormone production).PathophysiologyDiffuse thyroid enlargement typically results from prolonged stimulation by thyroid-stimulating hormone (TSH) or TSH-like agents, commonly seen in hypothyroidism or iodine deficiency. In contrast, in hyperthyroid...

The Thyroid Gland

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The thyroid gland is a small, butterfly-shaped gland located in the neck and covers the anterior surface of the trachea. The gland has two lateral lobes connected by a thin tissue mass called the isthmus. Internally, each lobe comprises many small spherical structures known as thyroid follicles, surrounded by a network of blood vessels.
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Graves Disease II: Pathophysiology

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Graves’ disease is an autoimmune disorder characterized by the production of thyroid-stimulating immunoglobulins (TSI) that activate TSH receptors, leading to excessive synthesis and release of thyroid hormones (T3 and T4) and resulting in hyperthyroidism.Among all causes of hyperthyroidism, Graves’ disease is the most common and can happen at any age, though it is more frequent in women. It produces a hypermetabolic state with features such as weight loss, tachycardia, tremor, and heat...

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The thyroid hormone (TH) plays a pivotal role in the intricate orchestration of physiological processes, exerting profound effects on development, metabolism, and homeostasis throughout different life stages.
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Spontaneous Murine Model of Anaplastic Thyroid Cancer

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Thyroid adenomas after solid cancer in childhood.

Nadia Haddy¹, Chiraz El-Fayech, Catherine Guibout

¹Radiation Epidemiology Group, INSERM, Villejuif, France.

International Journal of Radiation Oncology, Biology, Physics

|June 8, 2012

Summary

Childhood cancer survivors exposed to radiation therapy have an increased risk of developing thyroid adenomas. Chemotherapy can modify this risk, especially with higher radiation doses.

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Area of Science:

Pediatric Oncology
Endocrinology
Radiation Oncology

Background:

Childhood cancer survivors are at increased risk for long-term health issues.
Thyroid adenomas are a potential late effect of cancer treatment, particularly radiation therapy.
Limited data exists on the specific risk factors for thyroid adenomas in this population.

Purpose of the Study:

To evaluate the association between radiation dose to the thyroid and chemotherapy exposure with the risk of thyroid adenoma in childhood cancer survivors.
To quantify the excess relative risk of thyroid adenoma per Gray of radiation dose.
To investigate the modifying effect of chemotherapy on the radiation dose-response relationship.

Main Methods:

A cohort of 3254 childhood cancer survivors treated before 1986 in France was studied.
Thyroid radiation doses were reconstructed based on treatment records.
Follow-up data was analyzed to identify cases of thyroid adenoma.

Main Results:

Thyroid adenoma risk increased with radiation dose up to a few Gray, then plateaued and declined.
Chemotherapy alone slightly increased risk but reduced the dose-response slope.
Excess relative risk per Gray was higher for younger patients and those receiving fewer chemotherapy drugs.

Conclusions:

The risk pattern for thyroid adenoma following childhood cancer radiation therapy resembles that of thyroid carcinoma.
Radiation dose is a significant risk factor, with chemotherapy potentially modifying the risk.
Age at radiation exposure is also a critical factor in adenoma development.