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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...
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...
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: May 25, 2026

An Orthotopic Mouse Model of Anaplastic Thyroid Carcinoma
07:01

An Orthotopic Mouse Model of Anaplastic Thyroid Carcinoma

Published on: April 17, 2013

Thyroid incidentaloma.

Judy Jin1, Christopher R McHenry

  • 1Cleveland Clinic Foundation, Cleveland, OH, United States, USA.

Best Practice & Research. Clinical Endocrinology & Metabolism
|February 7, 2012
PubMed
Summary
This summary is machine-generated.

Thyroid incidentalomas, or unexpected thyroid lesions, are often found incidentally. A detailed ultrasound is crucial for evaluating these lesions, regardless of initial imaging findings.

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

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Area of Science:

  • Radiology
  • Endocrinology
  • Oncology

Background:

  • Thyroid incidentaloma is defined as an unsuspected, asymptomatic thyroid lesion discovered during imaging or surgery unrelated to the thyroid.
  • These lesions are most commonly detected via ultrasound, followed by CT, MRI, carotid duplex, and PET scans.

Observation:

  • The incidence of carcinoma in incidentally discovered thyroid disease is significant.
  • CT, MRI, and PET imaging have notable limitations for evaluating the thyroid gland.

Findings:

  • A thorough sonographic evaluation is recommended for all patients with a thyroid incidentaloma.
  • Sonographically confirmed thyroid nodules require management similar to clinically apparent nodules.

Implications:

  • This highlights the importance of ultrasound in the diagnostic pathway for incidental thyroid findings.
  • Standardized management protocols for incidentally discovered thyroid nodules ensure appropriate patient care.