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Related Concept Videos

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...
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...
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...
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...
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...
Hypothyroidism II: Pathophysiology01:23

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...

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Related Experiment Video

Updated: Jun 23, 2026

Mixed Reality Assisted Radical Endoscopic Thyroidectomy
08:06

Mixed Reality Assisted Radical Endoscopic Thyroidectomy

Published on: January 31, 2025

[Management of thyroid nodule].

L Leenhardt1

  • 1Service de Médecine Nucléaire, Groupe Hospitalier Pitié Salpétrière, 83 boulevard de l'Hôpital, 75013 Paris, France. laurence.leenhardt@psl.aphp.fr

Journal De Radiologie
|May 8, 2009
PubMed
Summary

The increased detection of thyroid nodules, particularly in women, necessitates careful management. Fine needle aspiration cytology (FNAC) is crucial for identifying nodules that require surgery, as imaging alone is insufficient.

Area of Science:

  • Endocrinology
  • Oncology
  • Radiology

Background:

  • The widespread use of advanced imaging techniques like ultrasonography, doppler, and CT has resulted in a significant increase in the detection of thyroid nodules.
  • Thyroid nodule management presents a recurring challenge in clinical practice, with a higher prevalence observed in women.

Observation:

  • Fine needle aspiration cytology (FNAC) is the most reliable method for evaluating suspicious thyroid nodules identified via ultrasound, guiding surgical decisions.
  • Diagnostic imaging modalities such as scintigraphy lack sufficient accuracy for predicting malignancy.
  • Nodule size is not a reliable indicator of malignancy, and cancer prevalence is similar in isolated nodules and multinodular goiters.

Findings:

  • Thyroid cancer accounts for 9-13% of nodules evaluated by FNAC.

Related Experiment Videos

Last Updated: Jun 23, 2026

Mixed Reality Assisted Radical Endoscopic Thyroidectomy
08:06

Mixed Reality Assisted Radical Endoscopic Thyroidectomy

Published on: January 31, 2025

  • The prognosis for differentiated thyroid carcinomas is generally favorable.

    • Implications:

    • Accurate diagnostic tools are essential for appropriate patient selection for surgery.
    • Further research may refine risk stratification and management strategies for the growing number of detected thyroid nodules.
    • Early diagnosis and treatment of differentiated thyroid cancer lead to good patient outcomes.