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Imaging Studies II: Positron Emission Tomography and Scintigraphy01:25

Imaging Studies II: Positron Emission Tomography and Scintigraphy

Positron Emission Tomography (PET) is a medical imaging technique that provides crucial insights into the body's physiological functions at a molecular level. It is an indispensable resource for diagnosing, staging, and monitoring various illnesses, notably cancer, neurological disorders, and cardiovascular conditions.
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Hyperthyroidism I: Introduction01:25

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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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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...
Graves Disease II: Pathophysiology01:24

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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, and heat...
Positron Emission Tomography01:29

Positron Emission Tomography

Positron emission tomography (PET) is a medical imaging technique involving radiopharmaceuticals — substances that emit short-lived radiation. Although the first PET scanner was introduced in 1961, it took 15 more years before radiopharmaceuticals were combined with the technique and revolutionized its potential.
One of the main requirements of a PET scan is a positron-emitting radioisotope, which is produced in a cyclotron and then attached to a substance used by the part of the body being...

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An Orthotopic Mouse Model of Anaplastic Thyroid Carcinoma
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Scintigraphic findings in 120 hyperthyroid cats.

Andrea M Harvey1, Angie Hibbert, Esther L Barrett

  • 1Department of Clinical Veterinary Science, Division of Companion Animals, University of Bristol, Langford, Bristol BS40 5DU, United Kingdom. a.m.harvey@bristol.ac.uk

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|September 12, 2008
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Nearly 20% of hyperthyroid cats have ectopic or multiple thyroid tissue areas, complicating surgical treatment. Scintigraphy can

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Area of Science:

  • Veterinary Medicine
  • Nuclear Medicine
  • Endocrinology

Background:

  • Hyperthyroidism is a common endocrine disorder in cats.
  • Thyroidectomy is a frequent treatment, but recurrence or complications can occur.
  • Ectopic thyroid tissue and intrathoracic thyroid tissue are potential challenges in treatment.

Purpose of the Study:

  • To characterize scintigraphic findings in hyperthyroid cats.
  • To determine the location of thyroid pathology in newly diagnosed and post-thyroidectomy cats.
  • To identify the prevalence and features of ectopic hyperfunctional thyroid tissue.

Main Methods:

  • Scintigraphy was used to evaluate a large population of hyperthyroid cats.
  • Scintigraphic findings were correlated with clinical data.
  • Cats with newly diagnosed hyperthyroidism and those post-thyroidectomy were included.

Main Results:

  • Approximately 20% of hyperthyroid cats exhibited multiple or intrathoracic hyperfunctional thyroid tissue.
  • Surgical thyroidectomy may not be curative in these cases.
  • Scintigraphy could not reliably differentiate between thyroid carcinoma and adenoma.
  • Intrathoracic tissue and multiple areas of increased radionuclide uptake (IRU) responded well to low-dose radioiodine treatment.

Conclusions:

  • Owners should be informed about the possibility of ectopic thyroid tissue before surgery.
  • Scintigraphy is crucial for identifying ectopic or multifocal thyroid tissue.
  • Intrathoracic and multifocal benign thyroid disease can be effectively managed with radioiodine therapy.