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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...

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,...

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...

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...

Hypothyroidism II: Pathophysiology

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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Transoral Robotic Total Thyroidectomy and Bilateral Central Regional Lymph Node Dissection for Papillary Thyroid Carcinoma

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[Primary thyroid extranodal marginal zone lymphoma].

L S Selivanova, D S Abramov, T M Birg

Arkhiv Patologii

|October 14, 2014

Summary

This study examines thyroid lymphoma, specifically extranodal marginal zone lymphoma. It highlights the link between autoimmune thyroiditis and lymphoma development, even when classic signs are absent.

Area of Science:

Oncology
Pathology
Immunology

Background:

Thyroid lymphomas are rare malignancies.
Understanding their clinical and morphological features is crucial for diagnosis.
Autoimmune thyroiditis is a potential risk factor for thyroid lymphoma.

Observation:

The study details a case of primary thyroid extranodal marginal zone lymphoma.
Tumor cells completely replaced thyroid tissue, obscuring typical chronic autoimmune thyroiditis signs.
Immunohistochemistry revealed residual follicle-like structures, confirming the autoimmune thyroiditis link.

Findings:

Extranodal marginal zone lymphoma can present with total thyroid tissue replacement.
Characteristic signs of chronic autoimmune thyroiditis may be histologically absent but detectable via immunohistochemistry.

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A strong association exists between autoimmune thyroiditis and thyroid lymphoma development.

Implications:

This case emphasizes the importance of immunohistochemistry in diagnosing thyroid lymphoma, especially when histological signs of autoimmune thyroiditis are masked.
It reinforces the etiological role of autoimmune thyroiditis in the pathogenesis of thyroid lymphoma.
Further research into the mechanisms linking autoimmune thyroiditis and thyroid lymphoma is warranted.