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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...
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...
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 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 11, 2026

An Orthotopic Mouse Model of Anaplastic Thyroid Carcinoma
07:01

An Orthotopic Mouse Model of Anaplastic Thyroid Carcinoma

Published on: April 17, 2013

Ectopic thyroid carcinoma. Case report.

G Lianos1, C Bali, V Tatsis

  • 1University Hospital of loannina, Department of Surgery, Greece.

Il Giornale Di Chirurgia
|May 11, 2013
PubMed
Summary
This summary is machine-generated.

A rare case of ectopic thyroglossal thyroid carcinoma was reported in a 63-year-old male. This highlights that while most thyroid cancers occur in the thyroid gland, ectopic thyroid carcinoma can arise in ectopic tissue.

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Area of Science:

  • Endocrinology
  • Surgical Oncology
  • Pathology

Background:

  • Ectopic thyroid tissue is found in various locations, including the neck and abdomen.
  • This tissue can undergo pathological processes like tumors, inflammation, and hyperplasia.
  • Rare presentations of ectopic thyroid tissue can pose diagnostic and therapeutic challenges.

Observation:

  • A case report details a 63-year-old Caucasian male with a normal orthotopic thyroid gland.
  • The patient presented with ectopic thyroglossal thyroid carcinoma.
  • This represents a rare instance of thyroid cancer originating outside the orthotopic thyroid gland.

Findings:

  • Thyroid carcinoma can rarely arise in ectopic thyroid tissue, despite 99% of cases developing within the orthotopic thyroid.
  • Ectopic thyroid carcinoma can occur in the neck or other body regions.
  • The case involved a thyroglossal origin of the carcinoma.

Implications:

  • Surgeons must consider the possibility of ectopic thyroid carcinoma when evaluating neck masses.
  • Early consideration of ectopic thyroid carcinoma can aid in timely diagnosis and treatment.
  • This case underscores the importance of recognizing rare presentations in thyroid pathology.