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Hyperthyroidism II: Pathophysiology

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: Introduction

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...

Graves' Disease I: Introduction

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...

Graves Disease II: Pathophysiology

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...

Goiter

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 Gland

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...

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Related Experiment Video

Updated: May 10, 2026

A Swin Transformer-Based Model for Thyroid Nodule Detection in Ultrasound Images

A Swin Transformer-Based Model for Thyroid Nodule Detection in Ultrasound Images

Published on: April 21, 2023

Does bethesda category predict aggressive features in malignant thyroid nodules?

David A Kleiman¹, Toni Beninato, Ashwin Soni

¹Division of Endocrine and Minimally Invasive Surgery, Department of Surgery, New York Presbyterian Hospital/Weill Cornell Medical College, New York, NY 10065, USA.

Annals of Surgical Oncology

|July 2, 2013

Summary

This summary is machine-generated.

The Bethesda Classification System for thyroid fine-needle aspirate (FNA) can predict cancer subtypes but not prognosis. Higher Bethesda categories (V-VI) were linked to more aggressive histologic subtypes, but outcomes were similar across all categories.

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A Swin Transformer-Based Model for Thyroid Nodule Detection in Ultrasound Images

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Published on: April 21, 2023

Computer-Aided Three-Dimensional Visualization in the Treatment of Locally Advanced Thyroid Cancer

Computer-Aided Three-Dimensional Visualization in the Treatment of Locally Advanced Thyroid Cancer

Published on: June 9, 2023

Area of Science:

Endocrinology
Oncology
Cytopathology

Background:

The Bethesda Classification System for thyroid fine-needle aspirate (FNA) is used to categorize thyroid nodules.
Its utility in predicting aggressive features of thyroid malignancies requires further investigation.

Purpose of the Study:

To evaluate if higher Bethesda categories (V-VI) correlate with more aggressive features compared to lower categories (III-IV).
To assess the prognostic significance of Bethesda categories in histologically confirmed thyroid malignancies.

Main Methods:

A retrospective review of 360 thyroid malignancies treated between 2004-2009.
Analysis of associations between preoperative FNA Bethesda category, patient demographics, histopathology, and clinical outcomes.
Inclusion criteria required definitive matching of FNA to surgical pathology.

Main Results:

Bethesda categories V-VI (80%) were more common than III-IV (20%).
Bethesda V-VI cancers showed higher rates of extrathyroidal extension, lymph node metastases, and multifocality compared to III-IV.
However, no differences in recurrence or survival were observed between groups, even within the same histologic subtype.

Conclusions:

The Bethesda Classification System may predict the likely histologic subtype of thyroid cancer.
Bethesda categories do not appear to have prognostic significance once a histologic diagnosis is established.