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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.
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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...

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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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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

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Graves' Disease I: Introduction

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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...

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Related Experiment Video

Updated: Apr 30, 2026

Spontaneous Murine Model of Anaplastic Thyroid Cancer

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Thymic teratoma masquerading as a thyroid lump.

W S Cho¹, R Sahota, F Tanweer

¹University Hospitals of Leicester NHS Trust, UK.

Annals of the Royal College of Surgeons of England

|May 1, 2014

Summary

This summary is machine-generated.

This case report describes a rare thymic teratoma in the neck, initially appearing as an intrathyroid mass. Management required a multidisciplinary approach and surgical expertise for this unusual presentation.

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Area of Science:

Oncology
Surgical Pathology
Endocrinology

Background:

Teratomas are germ cell tumors typically found in the sacrococcygeal region, ovaries, or testes.
Neck teratomas are exceptionally rare, with thymic teratomas presenting as intrathyroid lesions being previously undescribed.

Observation:

A case of a thymic teratoma presenting as an apparent intrathyroid lesion in the neck is detailed.
The unusual presentation necessitated two surgical interventions and a multidisciplinary management strategy.

Findings:

This case highlights a previously undocumented presentation of a neck teratoma originating from the thymus.
The lesion mimicked an intrathyroidal mass, complicating initial diagnosis and surgical planning.

Implications:

This case underscores the importance of surgical preparedness for unexpected findings during neck mass resections.
A multidisciplinary approach and consideration for conversion to exploratory surgery are crucial for managing rare congenital neck masses.