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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...

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...

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 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...

Endoscopic Procedures IV: Sigmoidoscopy and Laproscopy

Endoscopic Procedures IV: Sigmoidoscopy and Laproscopy

Sigmoidoscopy and laparoscopy are distinct medical procedures that enable physicians to internally inspect different parts of the GI tract. Although they serve different purposes, each is essential for diagnosing and, in some cases, treating various medical conditions.
Sigmoidoscopy
Sigmoidoscopy is a diagnostic procedure that uses a flexible sigmoidoscope equipped with a light source and camera to examine the rectum and sigmoid colon. The procedure involves inserting the tube through the anus...

Functions of Thyroid Hormones

Functions of Thyroid Hormones

The thyroid hormone (TH) plays a pivotal role in the intricate orchestration of physiological processes, exerting profound effects on development, metabolism, and homeostasis throughout different life stages.
TH is indispensable for the normal development and maturation of the skeletal, muscular, and nervous systems during fetal and childhood growth. It facilitates bone mineral turnover and regulates protein synthesis in developing tissues, contributing significantly to overall growth and...

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Related Experiment Video

Updated: May 10, 2026

Minimal Invasive Resection of Large Retrosternal Thyroid Goiter

Minimal Invasive Resection of Large Retrosternal Thyroid Goiter

Published on: September 20, 2024

One-day thyroid surgery - is it safe?

Maria Wieloch, Piotr Koza, Krzysztof Kuzdak

Polski Przeglad Chirurgiczny

|July 6, 2013

Summary

One-day thyroid surgery presents risks, including nerve paralysis and bleeding. Postoperative complications like tetany indicate that same-day procedures are not entirely safe.

Area of Science:

Endocrinology
Surgical Oncology
Otolaryngology

Background:

Thyroidectomy is a common surgical procedure.
Assessing the safety of same-day discharge after thyroid surgery is crucial for patient outcomes.

Purpose of the Study:

To evaluate the safety of one-day thyroid surgery by analyzing the incidence of early postoperative complications.

Main Methods:

A retrospective study of 726 patients undergoing total thyroidectomy between January 2012 and February 2013.
Monitoring for recurrent laryngeal nerve paralysis, postoperative bleeding, and hypocalcemia-related tetany.
Analysis of parathyroid hormone (PTH) and serum calcium levels at 6 and 20 hours post-surgery in subgroups.

Main Results:

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Gasless Endoscopic Thyroidectomy via the Trans-Axillary Approach

Gasless Endoscopic Thyroidectomy via the Trans-Axillary Approach

Published on: September 15, 2023

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Last Updated: May 10, 2026

Minimal Invasive Resection of Large Retrosternal Thyroid Goiter

Minimal Invasive Resection of Large Retrosternal Thyroid Goiter

Published on: September 20, 2024

Gasless Endoscopic Thyroidectomy via the Trans-Axillary Approach

Gasless Endoscopic Thyroidectomy via the Trans-Axillary Approach

Published on: September 15, 2023

Early complications included recurrent laryngeal nerve paralysis (3.07%) and postoperative bleeding (1.65%).
Tetany symptoms were significantly associated with decreased parathyroid hormone (PTH) and serum calcium levels.
The incidence of tetany varied from 0.5% to 35% depending on hormone and calcium levels, and timing of assessment.

Conclusions:

One-day thyroid surgery is associated with significant early postoperative complications.
The incidence of complications suggests that same-day discharge may not be a completely safe approach for all thyroidectomy patients.