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Related Concept Videos

Goiter01:27

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: Introduction01:25

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: Pathophysiology01:27

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...
Synthesis and Regulation of Thyroid Hormones01:20

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...
Graves Disease II: Pathophysiology01:24

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...
Graves' Disease I: Introduction01:28

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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Synchronous Triplanar Reconstruction Integrated with Color Doppler Mapping for Precise and Rapid Localization of Thyroid Lesions
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[Scintigraphically "hot" thyroid nodules mainly go hand in hand with a normal TSH].

Rainer Görges1, T Kandror, S Kuschnerus

  • 1Klinik für Nuklearmedizin, Universitätsklinikum Essen, Hufelandstr. 55, 4512 Essen, Germany. rainer.goerges@uni-due.de

Nuklearmedizin. Nuclear Medicine
|July 27, 2011
PubMed
Summary

Thyroid scintigraphy is valuable in Germany, even with normal TSH levels. Most autonomous thyroid nodules detected via scintigraphy show normal TSH, supporting broader diagnostic use.

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Area of Science:

  • Nuclear medicine
  • Endocrinology
  • Thyroidology

Background:

  • International guidelines suggest thyroid scintigraphy only for subnormal TSH.
  • Germany's lower iodine intake may increase autonomous thyroid nodules.
  • Data on scintigraphy's utility with normal TSH in Germany are limited.

Purpose of the Study:

  • To evaluate the spectrum of scintigraphically "hot" and "warm" thyroid nodules in Germany.
  • To assess the TSH levels in patients with autonomous thyroid nodules.
  • To determine the relevance of TSH levels for thyroid scintigraphy indications in Germany.

Main Methods:

  • Multicenter analysis of 514 patients from 10 German nuclear medicine outpatient institutions.
  • Inclusion criteria: unequivocally hyperfunctional nodules (≥1 cm) detected by (99m)Tc-pertechnetate scintigraphy.
  • Parameters recorded: thyroid hormone levels, (99m)Tc-uptake (TcTU), nodule size, and autonomous nodular volume (V(aut)).

Main Results:

  • Only 20% of patients with "hot" nodules had subnormal TSH levels.
  • The majority of patients had TSH levels within the normal range (0.34–3.5 mU/l).
  • No significant correlation was found between TSH levels and TcTU or V(aut).

Conclusions:

  • Autonomous thyroid nodules in Germany frequently present with normal TSH levels.
  • Scintigraphy findings for autonomous nodules are highly informative and can be safely classified as benign.
  • Restricting scintigraphy to patients with subnormal TSH is not justified in Germany.