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Related Concept Videos

Hyperthyroidism II: Pathophysiology01:27

Hyperthyroidism II: Pathophysiology

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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...
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The Thyroid Gland

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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...
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Graves Disease II: Pathophysiology01:24

Graves Disease II: Pathophysiology

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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,...
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Hypothyroidism II: Pathophysiology01:23

Hypothyroidism II: Pathophysiology

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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...
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Ultrasonography01:17

Ultrasonography

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Ultrasonography is an imaging technique that uses high-frequency sound waves to visualize the body's internal structures. It is a non-invasive and safe procedure that does not involve the use of ionizing radiation, making it widely used in various medical fields. Ultrasonography is used to study heart function, blood flow in the neck or extremities, certain conditions such as gallbladder disease, and fetal growth and development.
During an ultrasonography procedure, a handheld device called...
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Hyperthyroidism I: Introduction01:25

Hyperthyroidism I: Introduction

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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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Author Spotlight: Integrating Ultrasound Imaging with Biochemical Markers for Thyroid Disease Diagnosis
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Thyroid lesions visualized on CT: sonographic and pathologic correlation.

Christopher Lee1, Brenna Chalmers1, Daniel Treister1

  • 1Department of Radiology, Keck School of Medicine of USC, 1500 San Pablo St, 2nd Floor Imaging, Los Angeles, CA 90033.

Academic Radiology
|September 30, 2014
PubMed
Summary
This summary is machine-generated.

Incidental thyroid lesions found on computed tomography (CT) scans are rarely malignant. Small, homogeneous, low-attenuation lesions identified by CT are highly likely to be benign, suggesting selective ultrasound (US) evaluation may be more cost-effective.

Keywords:
Computed tomographyincidental lesionthyroid malignancythyroid noduleultrasound

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Area of Science:

  • Radiology
  • Endocrinology
  • Oncology

Background:

  • Management guidelines for incidental thyroid lesions detected via computed tomography (CT) are lacking.
  • CT is increasingly used for chest and neck imaging, leading to incidental detection of thyroid lesions.
  • Distinguishing benign from malignant incidental thyroid lesions on CT is crucial for appropriate patient management.

Purpose of the Study:

  • To assess the correlation between computed tomography (CT) and ultrasound (US) characteristics of thyroid lesions.
  • To identify CT imaging features that predict benignity or malignancy in thyroid lesions.
  • To evaluate the clinical utility of routine ultrasound (US) screening for incidentally detected thyroid lesions.

Main Methods:

  • Retrospective review of CT and thyroid ultrasound (US) examinations in 259 patients with visible thyroid lesions on CT.
  • Pathologic confirmation via fine-needle aspiration (FNA) or surgical excision was used for lesion classification.
  • Statistical analyses, including Fisher exact tests, Spearman correlations, and logistic regression, were employed to identify CT predictors of lesion behavior.

Main Results:

  • Malignancy prevalence was low for incidental thyroid lesions (1.8%) compared to palpable/symptomatic lesions (10.2%).
  • No CT characteristics definitively predicted malignancy.
  • Smaller lesion size, lower mean CT attenuation, and homogeneous composition were significantly associated with benign or indeterminate nodules on multivariate analysis.

Conclusions:

  • Routine ultrasound (US) evaluation for all incidentally detected thyroid lesions may not be cost-effective due to the high prevalence of incidentalomas and low malignancy rates.
  • Incidental thyroid lesions on CT that are small, homogeneous, and have low attenuation are highly likely to be benign.
  • CT characteristics can aid in risk stratification, potentially reducing unnecessary diagnostic workups for benign incidental thyroid findings.