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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...

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,...

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...

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...

Synthesis and Regulation of Thyroid Hormones

Synthesis and Regulation of Thyroid Hormones

Low blood levels of the thyroid hormones — triiodothyronine (T3) and thyroxine (T4) — signal the hypothalamus to release the thyrotropin-releasing hormone (TRH). TRH then reaches the pituitary gland and stimulates the release of thyroid-stimulating hormone(TSH) into the bloodstream.
Upon reaching the thyroid gland, TSH stimulates the follicular cells' active uptake of iodide ions from the blood. The ions diffuse to the apical surface of the cells and are oxidized to iodine. The...

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Spontaneous Murine Model of Anaplastic Thyroid Cancer

Spontaneous Murine Model of Anaplastic Thyroid Cancer

Published on: February 3, 2023

A rare cause of hyperthyroidism: functioning thyroid metastases.

Daphne Gardner¹, Su Chin Ho²

¹Department of Endocrinology, Singapore General Hospital, Singapore, Singapore.

BMJ Case Reports

|October 11, 2014

Summary

This case study highlights a rare cause of hyperthyroidism: autonomously functioning thyroid metastases. Correctly identifying the etiology of hyperthyroidism is crucial for effective patient management and improved outcomes.

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Area of Science:

Endocrinology
Oncology
Nuclear Medicine

Background:

Hyperthyroidism is a common endocrine disorder often managed with antithyroid medications.
Accurate etiological diagnosis of hyperthyroidism is essential for appropriate treatment strategies and patient prognosis.

Observation:

A 66-year-old woman presented with hyperthyroidism and goiter, initially suspected to be a toxic nodule.
Diagnostic tests, including Tc-99m pertechnetate uptake scan and TSH receptor antibody levels, were negative, ruling out typical toxic nodule or Graves' disease.
Thyroid function remained difficult to control despite initial management.

Findings:

Histopathology after total thyroidectomy revealed follicular variant papillary thyroid carcinoma.
Postoperative levothyroxine therapy led to severe hyperthyroidism, indicating autonomously functioning thyroid metastases as the underlying cause.
This rare presentation underscores the importance of considering metastatic disease in refractory hyperthyroidism.

Implications:

Autonomously functioning thyroid metastases, though rare, must be included in the differential diagnosis of hyperthyroidism.
Recognizing this unusual etiology is critical for tailoring treatment and potentially altering patient outcomes.
This case emphasizes the need for comprehensive diagnostic evaluation in complex hyperthyroid cases.