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Related Concept Videos

Hyperthyroidism I: Introduction01:25

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: Pathophysiology01:27

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 Gland01:23

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...
Goiter01:27

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...
Graves Disease II: Pathophysiology01:24

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: Introduction01:28

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: Jul 16, 2026

Substernal Thyroid Biopsy Using Endobronchial Ultrasound-guided Transbronchial Needle Aspiration
10:19

Substernal Thyroid Biopsy Using Endobronchial Ultrasound-guided Transbronchial Needle Aspiration

Published on: November 10, 2014

[Focal thyroid incidentaloma: evidence-based management].

Alexandra Borges1

  • 1Serviço de Radiologia, Instituto Português de Oncologia, Lisboa, Portugal.

Acta Medica Portuguesa
|March 3, 2007
PubMed
Summary

Subclinical thyroid nodules are increasingly found incidentally. This study provides evidence-based guidelines and algorithms to standardize their management and follow-up, addressing current clinical controversies.

Area of Science:

  • Endocrinology
  • Radiology
  • Public Health

Background:

  • Increasing incidental detection of thyroid nodules during imaging for other conditions presents a clinical challenge.
  • Lack of long-term follow-up data and standardized guidelines leads to varied clinical management of subclinical thyroid nodules.
  • Controversies exist regarding the optimal approach to subclinical thyroid nodules, impacting patient care and public health.

Purpose of the Study:

  • To address the lack of standardized guidelines for subclinical thyroid nodules.
  • To provide evidence-based algorithms for the management and follow-up of incidentally detected thyroid nodules.
  • To reduce clinical controversy and standardize the approach to subclinical thyroid nodules.

Main Methods:

  • Extensive literature review on subclinical thyroid nodules.

Related Experiment Videos

Last Updated: Jul 16, 2026

Substernal Thyroid Biopsy Using Endobronchial Ultrasound-guided Transbronchial Needle Aspiration
10:19

Substernal Thyroid Biopsy Using Endobronchial Ultrasound-guided Transbronchial Needle Aspiration

Published on: November 10, 2014

  • Development of evidence-based guidelines.
  • Creation of management and follow-up algorithms.

    • Main Results:

    • Consensual guidelines for subclinical thyroid nodules are lacking.
    • Varied clinical approaches and controversies exist in managing these nodules.
    • Algorithms are provided to standardize care.

    Conclusions:

    • Standardized management and follow-up protocols for subclinical thyroid nodules are necessary.
    • Evidence-based algorithms can guide clinicians in managing incidentally detected thyroid nodules.
    • Further research and long-term studies are needed to refine guidelines.