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Related Concept Videos

Hypothyroidism II: Pathophysiology01:23

Hypothyroidism II: Pathophysiology

Hypothyroidism is a disorder characterized by insufficient production of thyroid hormones, which regulate metabolism, energy balance, and multiple organ systems.TypesHypothyroidism is classified based on the level of dysfunction. Primary hypothyroidism results from intrinsic thyroid gland dysfunction, causing reduced hormone production despite normal or increased stimulation. Secondary hypothyroidism arises from inadequate thyroid-stimulating hormone (TSH) secretion by the pituitary. Tertiary...
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...
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...
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...

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Related Experiment Video

Updated: Jun 6, 2026

Generation of a Mouse Spontaneous Autoimmune Thyroiditis Model
04:39

Generation of a Mouse Spontaneous Autoimmune Thyroiditis Model

Published on: March 17, 2023

Congenital hypothyroidism: etiology.

V M A Dias1, A P C B Campos, A J Chagas

  • 1Department of Pediatrics, Minas Gerais Federal University, Belo Horizonte, Brazil. veradias@medicina.ufmg.br

Journal of Pediatric Endocrinology & Metabolism : JPEM
|November 16, 2010
PubMed
Summary

Congenital hypothyroidism (CH) causes vary, with thyroid dysgenesis being more severe than in situ thyroid issues. Understanding CH etiology is crucial for effective management and genetic counseling.

Related Experiment Videos

Last Updated: Jun 6, 2026

Generation of a Mouse Spontaneous Autoimmune Thyroiditis Model
04:39

Generation of a Mouse Spontaneous Autoimmune Thyroiditis Model

Published on: March 17, 2023

Area of Science:

  • Endocrinology
  • Pediatrics
  • Medical Genetics

Background:

  • Congenital hypothyroidism (CH) is a significant condition affecting neonatal health.
  • Determining the etiology of CH is vital for prognosis, genetic counseling, and clinical management.

Purpose of the Study:

  • To investigate the diverse causes of congenital hypothyroidism (CH) in neonates.
  • To assess the severity of CH based on serum levels of FreeT4 and TSH.
  • To correlate CH etiology with thyroid function parameters.

Main Methods:

  • Analysis of 243 neonates diagnosed with CH via the Neonatal Screening Program.
  • Assessment of thyroid function using serum FreeT4 and TSH levels.
  • Etiological evaluation through ultrasonography, scintigraphy, potassium perchlorate discharge test, and serum thyroglobulin levels.

Main Results:

  • Thyroid dysgenesis was identified in 47% of cases, including athyreosis, ectopic glands, and hypoplasia.
  • In situ thyroid glands were observed in 52% of patients, with iodide organification defects being common.
  • Patients with dysgenesis exhibited significantly more severe CH (higher TSH, lower FT4) compared to those with in situ thyroids.

Conclusions:

  • Complex dysgenesis, including ectopia with dysgenetic eutopic glands, was noted.
  • Ultrasound is effective for detecting dysgenetic tissue, while scintigraphy excels at identifying functioning thyroid tissue.
  • Thyroid hormone synthesis defects are more prevalent than anticipated, though some cases remain undefined.