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Related Concept Videos

Synthesis and Regulation of Thyroid Hormones01:20

Synthesis and Regulation of Thyroid Hormones

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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.
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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.
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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.
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Thyroid function alterations after radiofrequency ablation in benign thyroid nodule management.

Yi-Han Chen1, Pi-Ling Chiang2, Cheng-Kang Wang1,3,4,5,6

  • 1Department of Diagnostic Radiology, Kaohsiung Chang Gung Memorial Hospital and Chang Gung University College of Medicine, Kaohsiung, Taiwan.

Therapeutic Advances in Endocrinology and Metabolism
|March 26, 2026
PubMed
Summary

Radiofrequency ablation (RFA) for benign thyroid nodules (BTNs) can alter thyroid function. Lower mid-term triiodothyronine (T3) levels after RFA may predict better nodule volume reduction, but do not indicate hypothyroidism.

Keywords:
benign thyroid nodulehypothyroidismradiofrequency ablationthyroid function

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Area of Science:

  • Endocrinology
  • Minimally Invasive Procedures
  • Thyroidology

Background:

  • Radiofrequency ablation (RFA) is an effective treatment for benign thyroid nodules (BTNs).
  • Post-procedural thyroid function changes are a known concern following RFA.
  • Understanding these changes is crucial for patient management.

Purpose of the Study:

  • To investigate the relationship between thyroid function changes and nodule volume reduction ratio (VRR) after RFA.
  • To determine if mid-term thyroid function fluctuations predict long-term hypothyroidism post-RFA.
  • To analyze the correlation between thyroid hormone levels and nodule shrinkage.

Main Methods:

  • Retrospective cohort study involving 50 euthyroid patients (72 BTNs) undergoing RFA.
  • Comprehensive assessments including clinical exams, ultrasound, and blood tests at baseline and follow-up intervals (6 months, 12 months, annually).
  • Analysis of thyroid function parameters (T3, TSH) and nodule VRR over a mean follow-up of 22.3 months.

Main Results:

  • Significant reductions in triiodothyronine (T3) and elevations in thyroid-stimulating hormone (TSH) were observed at medium-term and long-term follow-ups.
  • A negative correlation was found between medium-term T3 levels and long-term VRR (r = -0.475, p = 0.001).
  • Lower mid-term T3 levels were associated with a significantly higher long-term VRR compared to higher T3 levels (0.89 vs 0.77, p = 0.030).

Conclusions:

  • Radiofrequency ablation for BTNs leads to notable thyroid function alterations, though not typically hypothyroidism.
  • Lower mid-term T3 levels may serve as an early indicator of favorable nodule volume reduction.
  • Further research is warranted to fully elucidate the long-term implications of these thyroid function changes.