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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...

The Thyroid Gland

The Thyroid Gland

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.
The follicles have a central cavity lined by simple cuboidal to squamous epithelial cells called follicular cells. These cells produce the glycoprotein...

Hyperthyroidism I: Introduction

Hyperthyroidism I: Introduction

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...

Graves Disease II: Pathophysiology

Graves Disease II: Pathophysiology

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...

Hypothyroidism II: Pathophysiology

Hypothyroidism II: Pathophysiology

Hypothyroidism is a disorder characterized by insufficient production of thyroid hormones, which regulate metabolism, energy balance, and multiple organ systems.TypesHypothyroidism is classified based on the level of dysfunction. Primary hypothyroidism results from intrinsic thyroid gland dysfunction, causing reduced hormone production despite normal or increased stimulation. Secondary hypothyroidism arises from inadequate thyroid-stimulating hormone (TSH) secretion by the pituitary. Tertiary...

Synthesis and Regulation of Thyroid Hormones

Synthesis and Regulation of Thyroid Hormones

Low blood levels of the thyroid hormones — triiodothyronine (T3) and thyroxine (T4) — signal the hypothalamus to release the thyrotropin-releasing hormone (TRH). TRH then reaches the pituitary gland and stimulates the release of thyroid-stimulating hormone(TSH) into the bloodstream.
Upon reaching the thyroid gland, TSH stimulates the follicular cells' active uptake of iodide ions from the blood. The ions diffuse to the apical surface of the cells and are oxidized to iodine. The iodine is then...

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Related Experiment Video

Updated: Jul 3, 2026

Minimal Invasive Resection of Large Retrosternal Thyroid Goiter

Minimal Invasive Resection of Large Retrosternal Thyroid Goiter

Published on: September 20, 2024

Ectopic posterior mediastinal thyroid: a case report.

Sami Karapolat¹, Ismet Bulut

¹Department of Thoracic Surgery, State Hospital, Bitlis, Turkey. samikarapolat@yahoo.com.

|July 23, 2008

Summary

This summary is machine-generated.

Ectopic thyroid tissue in the posterior mediastinum is rare. Surgical resection of this rare condition offers a cure and good prognosis for patients.

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Substernal Thyroid Biopsy Using Endobronchial Ultrasound-guided Transbronchial Needle Aspiration

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Published on: November 10, 2014

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Last Updated: Jul 3, 2026

Minimal Invasive Resection of Large Retrosternal Thyroid Goiter

Minimal Invasive Resection of Large Retrosternal Thyroid Goiter

Published on: September 20, 2024

Substernal Thyroid Biopsy Using Endobronchial Ultrasound-guided Transbronchial Needle Aspiration

Substernal Thyroid Biopsy Using Endobronchial Ultrasound-guided Transbronchial Needle Aspiration

Published on: November 10, 2014

Area of Science:

Endocrinology
Thoracic Surgery
Diagnostic Imaging

Background:

Posterior mediastinal ectopic thyroid is an exceptionally rare condition.
Cases are typically discovered incidentally through radiographic imaging.

Purpose of the Study:

To report a case of ectopic thyroid in the posterior mediastinum.
To highlight the diagnostic and therapeutic approach for this rare entity.

Main Methods:

A 74-year-old male presented with a posterior mediastinal mass.
Intraoperative frozen section confirmed ectopic thyroid tissue.
The mass was completely surgically resected.

Main Results:

The patient experienced a complete recovery.
No complications were observed one year post-surgery.

Conclusions:

Surgical resection is an effective treatment for ectopic posterior mediastinal thyroid.
The prognosis for surgically treated patients is favorable.