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Related Concept Videos

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...
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...
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...
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...
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...
Endoscopic Studies I: Bronchoscopy and Thoracoscopy01:30

Endoscopic Studies I: Bronchoscopy and Thoracoscopy

Endoscopy is a non-surgical medical technique used to examine a person's internal organs and vessels. This lesson will focus on two types of endoscopic studies: bronchoscopy and thoracoscopy.
Bronchoscopy
Description
Bronchoscopy is a procedure that involves direct visualization of the larynx, trachea, and bronchi for diagnostic and therapeutic purposes. A flexible fiber optic or rigid bronchoscope is used to carry out the procedure. The fiber-optic bronchoscope is more frequently used due to...

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Related Experiment Video

Updated: Jul 13, 2026

"Sun's Seven-Step Technique" for Endoscopic En-Bloc Resection of Thyroid Cancer via the Chest-Breast Approach
07:45

"Sun's Seven-Step Technique" for Endoscopic En-Bloc Resection of Thyroid Cancer via the Chest-Breast Approach

Published on: November 28, 2025

Thyroid nodules - stepwise diagnosis and management.

Stergios A Polyzos1, Marina Kita, Avraam Avramidis

  • 1Department of Endocrinology, "Hippokratio" General Hospital, Thessaloniki, Greece. stergios@endo.gr

Hormones (Athens, Greece)
|August 21, 2007
PubMed
Summary

Thyroid nodules are increasingly found due to advanced imaging. This review outlines a five-step approach for diagnosing and managing thyroid nodules, distinguishing between benign and malignant cases for appropriate treatment.

Related Experiment Videos

Last Updated: Jul 13, 2026

"Sun's Seven-Step Technique" for Endoscopic En-Bloc Resection of Thyroid Cancer via the Chest-Breast Approach
07:45

"Sun's Seven-Step Technique" for Endoscopic En-Bloc Resection of Thyroid Cancer via the Chest-Breast Approach

Published on: November 28, 2025

Area of Science:

  • Endocrinology
  • Oncology
  • Radiology

Background:

  • Thyroid nodules are common, with rising incidence linked to increased neck imaging.
  • Incidental findings in asymptomatic patients are frequent.
  • Accurate diagnosis is vital for determining surgical necessity versus patient follow-up.

Purpose of the Study:

  • To present a structured, five-step approach for managing thyroid nodules.
  • To guide clinicians from initial detection to treatment decisions.
  • To emphasize the importance of differential diagnosis in thyroid nodule management.

Main Methods:

  • Review of current clinical practices and diagnostic standards for thyroid nodules.
  • Discussion of the role of Fine-Needle Aspiration biopsy as the gold standard.
  • Evaluation of ultrasonography (US) in nodule monitoring and recurrence detection.

Main Results:

  • Fine-Needle Aspiration biopsy is key for surgical selection.
  • Ultrasonography aids in monitoring nodule size and detecting recurrence but lacks specific malignancy indicators.
  • Histological findings post-surgery provide definitive diagnosis and guide therapy.

Conclusions:

  • A systematic approach is essential for effective thyroid nodule management.
  • Distinguishing between benign and malignant nodules is critical for patient outcomes.
  • Treatment strategies are based on cytological and histological evaluations.