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Related Concept Videos

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...
Synthesis and Regulation of Thyroid Hormones01:20

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...
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...
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...
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...

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Related Experiment Video

Updated: May 28, 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

Update in thyroid fine needle aspiration.

William C Faquin1, Massimo Bongiovanni, Peter M Sadow

  • 1Department of Pathology, WRN 219, Massachusetts General Hospital, 55 Fruit Street, Boston, MA 02114, USA. WFaquin@Partners.org

Endocrine Pathology
|October 15, 2011
PubMed
Summary
This summary is machine-generated.

Thyroid fine needle aspiration (FNA) is a popular and effective diagnostic tool for thyroid nodules. Ongoing research aims to refine its use in diagnosing follicular tumors and managing atypical results.

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Transoral Robotic Total Thyroidectomy and Bilateral Central Regional Lymph Node Dissection for Papillary Thyroid Carcinoma
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Transoral Robotic Total Thyroidectomy and Bilateral Central Regional Lymph Node Dissection for Papillary Thyroid Carcinoma

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Last Updated: May 28, 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

Transoral Robotic Total Thyroidectomy and Bilateral Central Regional Lymph Node Dissection for Papillary Thyroid Carcinoma
04:01

Transoral Robotic Total Thyroidectomy and Bilateral Central Regional Lymph Node Dissection for Papillary Thyroid Carcinoma

Published on: September 15, 2023

Area of Science:

  • Endocrinology
  • Cytopathology
  • Oncology

Background:

  • Thyroid fine needle aspiration (FNA) is a widely used, safe, and cost-effective method for initial thyroid nodule management.
  • Over 350,000 thyroid FNAs are performed annually in the USA, highlighting its clinical significance.

Purpose of the Study:

  • To address key challenges and refine the application of thyroid FNA in clinical practice.
  • To improve the diagnostic accuracy for follicular-patterned thyroid tumors.
  • To establish optimal management strategies for atypical thyroid FNA results and poorly differentiated thyroid carcinomas.

Main Methods:

  • Review and synthesis of current literature and clinical guidelines.
  • Analysis of diagnostic challenges in thyroid nodule evaluation.
  • Discussion of evolving techniques and management protocols for thyroid FNA.

Main Results:

  • Thyroid FNA is a valuable tool for initial thyroid nodule assessment.
  • Specific areas for improvement include differentiating follicular neoplasms and managing indeterminate FNA findings.
  • Further research is needed to optimize the use of FNA in evaluating poorly differentiated thyroid cancers.

Conclusions:

  • Thyroid FNA remains a cornerstone in thyroid nodule evaluation.
  • Refining FNA application is crucial for accurate diagnosis and appropriate patient management.
  • Addressing current limitations will enhance the utility of FNA in complex thyroid cases.