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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...
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...
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...
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 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...
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...

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An Orthotopic Mouse Model of Anaplastic Thyroid Carcinoma
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A case report of large thymic hyperplasia associated with hyperthyroidism.

Koji Takami1, Hideyasu Omiya, Masahiko Higashiyama

  • 1Department of Surgery, National Hospital Organization Osaka National Hospital, Osaka, Japan.

Annals of Thoracic and Cardiovascular Surgery : Official Journal of the Association of Thoracic and Cardiovascular Surgeons of Asia
|January 19, 2010
PubMed
Summary

Large thymic hyperplasia in a 32-year-old female resolved with antithyroid drug treatment. This thymic lymphoid hyperplasia mass, linked to hyperthyroidism, shrank significantly, highlighting a non-surgical treatment option.

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Area of Science:

  • Endocrinology
  • Thoracic Surgery
  • Pathology

Background:

  • Hyperthyroidism can be associated with thymic abnormalities, including thymic hyperplasia.
  • Large mediastinal masses require careful diagnostic evaluation to differentiate between neoplastic and non-neoplastic conditions.

Observation:

  • A 32-year-old female presented with a large (16 x 11 cm) mediastinal mass and hyperthyroidism.
  • Computed tomography (CT) revealed a heterogeneous mass with soft tissue and fat densities, diagnosed histologically as thymic lymphoid hyperplasia.

Findings:

  • The thymic mass enlarged during hyperthyroidism and regressed by approximately one-third after treatment with antithyroid drugs.
  • Post-treatment CT scans showed a decrease in soft tissue density and a predominance of fat density within the residual mass.
  • The mass size stabilized for over six years after initial regression.

Implications:

  • Hyperthyroidism-related thymic hyperplasia may respond favorably to antithyroid therapy, suggesting a potential non-surgical management approach.
  • Conservative management with antithyroid drugs should be considered before surgical resection for thymic masses associated with hyperthyroidism.
  • This case underscores the importance of evaluating thyroid status in patients with mediastinal masses and considering the dynamic nature of thymic hyperplasia in response to hormonal changes.