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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 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...

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...

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...

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...

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Related Experiment Video

Updated: Jun 6, 2026

An Orthotopic Mouse Model of Anaplastic Thyroid Carcinoma

An Orthotopic Mouse Model of Anaplastic Thyroid Carcinoma

Published on: April 17, 2013

[Solitary hyperfunctioning thyroid gland carcinomas].

V Zivaljevic¹, R Zivic, A Diklic

¹Endocrine Surgery, Clinical Center of Serbia, Belgrade, Serbia.

Zentralblatt Fur Chirurgie

|November 18, 2010

Summary

This summary is machine-generated.

While typically appearing as non-functional, a small percentage of solitary hyperfunctioning thyroid nodules are malignant. This study found about 1% of operated hyperfunctioning nodules were carcinomas, highlighting the need to consider malignancy in treatment plans.

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Spontaneous Murine Model of Anaplastic Thyroid Cancer

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Last Updated: Jun 6, 2026

An Orthotopic Mouse Model of Anaplastic Thyroid Carcinoma

An Orthotopic Mouse Model of Anaplastic Thyroid Carcinoma

Published on: April 17, 2013

Spontaneous Murine Model of Anaplastic Thyroid Cancer

Spontaneous Murine Model of Anaplastic Thyroid Cancer

Published on: February 3, 2023

Area of Science:

Endocrinology
Oncology
Nuclear Medicine

Background:

Thyroid carcinomas often present as hypofunctional lesions on scintigraphy.
Rarely, thyroid cancers can manifest as hyperfunctional nodules.
This study investigates the frequency and characteristics of carcinomas in solitary hyperfunctional thyroid nodules.

Purpose of the Study:

To determine the incidence of thyroid carcinoma in patients operated for solitary hyperfunctional nodules.
To describe the demographic and clinical features of these malignant cases.

Main Methods:

Retrospective analysis of 308 patients operated for solitary hyperfunctional thyroid nodules between 1997 and 2006.
Histopathological examination of surgical specimens to confirm malignancy.

Main Results:

Malignancy was detected in approximately 3% of cases.
Real hyperfunctional carcinomas were confirmed in 1% of patients (3 cases).
Diagnoses included 2 follicular carcinomas and 1 papillary carcinoma, all in preoperatively hyperthyroid patients.

Conclusions:

The frequency of solitary hyperfunctioning thyroid carcinomas is approximately 1%.
The potential for malignancy should be considered when managing hyperfunctional thyroid nodules.
This finding impacts diagnostic and treatment strategies for thyroid nodules.