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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...

Goiter

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...

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 receptors...

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...

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 iodine is then...

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"Sun's Seven-Step Technique" for Endoscopic En-Bloc Resection of Thyroid Cancer via the Chest-Breast Approach

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[Management for thyroid nodules].

Hirotoshi Nakamura¹

¹Department of Medicine, Kuma Hospital.

Nihon Rinsho. Japanese Journal of Clinical Medicine

|December 11, 2012

Summary

Thyroid nodules are common, and distinguishing benign from malignant ones is challenging. New Japan Thyroid Association guidelines will refine diagnosis using ultrasonography and fine needle aspiration cytology.

Area of Science:

Endocrinology
Oncology
Radiology

Background:

Thyroid nodules are highly prevalent, particularly in Japan, with ultrasonography detecting them in a significant portion of the population.
Differentiating between benign and malignant thyroid nodules presents diagnostic challenges.
The Japan Thyroid Association (JTA) is developing new guidelines for thyroid nodule management.

Purpose of the Study:

To outline the forthcoming JTA guidelines for managing thyroid nodules.
To emphasize the roles of ultrasonography (US) and fine needle aspiration cytology (FNA) in nodule evaluation.
To discuss updates in thyroid nodule classification systems.

Main Methods:

Utilizing ultrasonography (US) for comprehensive nodule assessment due to its safety and information yield.

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Employing fine needle aspiration cytology (FNA) for cytopathological analysis of nodules.

Adopting a modified World Health Organization (WHO) classification for FNA, dividing indeterminate cases into 'Indeterminate A' and 'Indeterminate B'.

Main Results:

The JTA guidelines will incorporate a modified WHO classification, subdividing indeterminate FNA results.
Re-FNA is not advised for 'Indeterminate A' (suspected follicular tumor) but may aid diagnosis in 'Indeterminate B' (other than follicular tumor).
The guidelines aim to improve the diagnostic accuracy and management of thyroid nodules, including papillary and follicular thyroid cancers.

Conclusions:

Ultrasonography and FNA are crucial for evaluating thyroid nodules.
The revised FNA classification by JTA offers a more nuanced approach to indeterminate cases.
These forthcoming guidelines are expected to enhance the clinical management of thyroid nodules and thyroid cancer.