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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...

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...

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...

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, and heat...

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...

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 in...

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Updated: May 24, 2026

Endoscopic Endonasal Trans-sphenoidal Approach: Minimally Invasive Surgery for Pituitary Adenomas

Endoscopic Endonasal Trans-sphenoidal Approach: Minimally Invasive Surgery for Pituitary Adenomas

Published on: January 17, 2018

Pituitary hyperplasia resulting from primary hypothyroidism.

Amit Agrawal¹, S K Diwan

¹Department of Neurosurgery, Datta Meghe Institute of Medical Sciences, Sawangi (Meghe), Wardha, Maharashtra, India.

Asian Journal of Neurosurgery

|February 21, 2012

Summary

Primary hypothyroidism can cause pituitary hyperplasia, mimicking pituitary apoplexy. Prompt thyroid hormone replacement therapy resolved symptoms in a young female patient, highlighting the importance of this treatment.

Keywords:

Endocrine hypothyroidism pituitary adenoma pituitary tumor thyroiditis

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Area of Science:

Endocrinology
Neuroscience

Background:

Pituitary hyperplasia is typically associated with conditions like pituitary adenomas or McCune-Albright syndrome.
Pituitary apoplexy, a rare complication of pituitary tumors, presents with sudden onset of headache, visual impairment, and ophthalmoplegia.

Observation:

A 22-year-old female presented with symptoms of headache, fatigue, facial changes, and voice hoarseness over six months.
The patient also experienced recent onset of diplopia and decreased vision.
Brain imaging revealed pituitary enlargement, and thyroid function tests indicated primary hypothyroidism.

Findings:

The pituitary enlargement was secondary to primary hypothyroidism, not a pituitary tumor.
Clinical symptoms resolved effectively with thyroid hormone replacement therapy.

Implications:

This case highlights that pituitary hyperplasia can be a rare manifestation of primary hypothyroidism.
It underscores the importance of considering endocrine disorders in the differential diagnosis of pituitary enlargement and apoplexy-like presentations.
Early diagnosis and treatment of hypothyroidism are crucial for managing secondary pituitary hyperplasia and preventing complications.