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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

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...

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...

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...

Graves' Disease I: Introduction

Graves' Disease I: Introduction

Graves' disease is an autoimmune disorder that causes hyperthyroidism, or overactivity of the thyroid gland. It results from autoantibodies called thyroid-stimulating immunoglobulins (TSIs), which bind to thyroid-stimulating hormone (TSH) receptors, leading to overstimulation of hormone production and a hypermetabolic state.EtiologyAlthough considered idiopathic, Graves’ disease has well-established contributing factors. There is a strong genetic component, with increased prevalence in...

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Related Experiment Video

Updated: Jun 12, 2026

Minimal Invasive Resection of Large Retrosternal Thyroid Goiter

Minimal Invasive Resection of Large Retrosternal Thyroid Goiter

Published on: September 20, 2024

[Retrosternal thyroid goiter: 20 years experience].

R Petkov, V Mladenovski, G Todorov

|June 1, 2010

Summary

Retrosternal thyroid goiters are common. Surgical intervention is essential due to potential malignancy and diagnostic challenges, requiring specialized thyroid surgeons for optimal patient outcomes.

Area of Science:

Endocrinology
Surgical Pathology
Thoracic Surgery

Context:

Retrosternal thyroid goiters are a recognized clinical entity.
Thyroid pathology extending into the mediastinum presents unique challenges.
A significant patient cohort with retrosternal thyroid disease was analyzed over two decades.

Purpose:

To investigate the prevalence and characteristics of retrosternal thyroid pathology.
To evaluate the diagnostic difficulties and malignancy potential in these cases.
To determine the optimal management strategy for retrosternal thyroid disease.

Summary:

A 20-year retrospective study analyzed 4225 patients with thyroid diseases, identifying 803 cases (19%) with retrosternal localization.
The analysis highlighted the increased risk of malignancy and diagnostic complexity associated with retrosternal thyroid masses.

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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

Gasless Endoscopic Thyroidectomy via the Trans-Axillary Approach

Gasless Endoscopic Thyroidectomy via the Trans-Axillary Approach

Published on: September 15, 2023

Related Experiment Videos

Last Updated: Jun 12, 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

Gasless Endoscopic Thyroidectomy via the Trans-Axillary Approach

Gasless Endoscopic Thyroidectomy via the Trans-Axillary Approach

Published on: September 15, 2023

Surgical treatment was deemed obligatory for retrosternal thyroid pathology.

Impact:

This research underscores the necessity of surgical intervention for retrosternal thyroid disease.
It emphasizes the critical role of experienced thyroid surgeons in managing these complex cases.
Findings contribute to refining surgical protocols and improving patient outcomes for mediastinal thyroid conditions.