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Ultrasonographic Characteristics of the Hyperfunctioning Thyroid Nodule and Predictive Factors for Thyroid Stimulating Hormone Suppression
Int J Thyroidol 2019;12(1):35-43
Published online May 30, 2019;  https://doi.org/10.11106/ijt.2019.12.1.35
© 2019 Korean Thyroid Association.

Won Sang Yoo1 and Hoon Sung Choi2

Department of Internal Medicine, Dankook University College of Medicine1, Cheonan, Department of Internal Medicine, Kangwon National University School of Medicine2, Chuncheon, Korea
Correspondence to: Hoon Sung Choi, MD, PhD, Department of Internal Medicine, Kangwon National University School of Medicine, 1 Gangwondaehak-gil, Chuncheon 24341, Korea
Tel: 82-33-258-9217, Fax: 82-33-258-2404, E-mail: reality0719@kangwon.ac.kr
Received September 20, 2018; Revised January 31, 2019; Accepted May 14, 2019.
This is an open-access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/4.0), which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.
Abstract
Background and Objectives: Thyroid scan is a good tool for diagnosis of hyperfunctioning thyroid nodules (HNs), however it has been limited in use in a primary clinical practice, because of its inconvenience and low accessibility. This study aimed to analyze ultrasonographic (US) characteristics of HNs and to predict HNs by US. Materials and Methods: We included 114 patients who exhibited results of ‘hot’ nodule in the thyroid scan from 2008 to 2017. Analysis for US characteristics included 73 patients without unclear US images and other inevitable reasons. We compared US characteristics of HNs with cold nodules that showed “cold” in the thyroid scan. Additionally, we compared US characteristics of HNs between suppressed thyroid-stimulating hormone (TSH) (<0.25 uIU/mL) or normal TSH, and analysis receiver operating characteristics (ROC) curve for prediction of suppressed TSH among HNs. Results: The HNs showed more partially cystic nodule, isoechoic echogenicity, hypervascularity and presence of halo in the US finding than the cold nodule. In subgroup analysis of nodules with TSH suppression among HNs, the TSH suppression nodules was lager in max size and volume than the normal TSH nodules. In ROC analyses for prediction of the TSH suppression among HNs, area under receiver operating characteristics curves was 0.736 in max size, 0.761 in volume. Conclusion: HNs showed more frequently partially cystic contents, isoechoic echogenicity, hypervascularity, and peripheral halo sign in US finding. Thyroid nodule size and volume were associated with suppressed TSH level of HNs, and optimal cutoff levels for prediction of TSH suppression among HNs were 2.6 cm and 1.13 cm3, respectively.
Keywords : Hyperfunctioning nodule, Ultrasonography, Thyrotropin