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Diagnostic value of two-dimensional shear wave elastography in papillary thyroid microcarcinoma

Authors Duan S, Yu J, Li X, Han Z, Zhai H, Liang P

Received 19 October 2015

Accepted for publication 15 January 2016

Published 9 March 2016 Volume 2016:9 Pages 1311—1317


Checked for plagiarism Yes

Review by Single-blind

Peer reviewers approved by Dr Norbert Ajeawung

Peer reviewer comments 2

Editor who approved publication: Professor Daniele Santini

Shao-Bo Duan,1,2 Jie Yu,2 Xin Li,2 Zhi-Yu Han,2 Hong-Yan Zhai,2 Ping Liang2

1Department of Interventional Ultrasound, Medical Center Tsinghua University, 2Department of Interventional Ultrasound, PLA General Hospital, Beijing, People’s Republic of China

Objective: The purpose of this study was to evaluate the predictability of two-dimensional shear wave elastography (2D-SWE) for papillary thyroid microcarcinoma (PTMC).
Materials and methods: One hundred and eighteen patients with 137 thyroid nodules (46 benign nodules, 91 malignant nodules) were included in this study who received conventional ultrasound (US) and 2D-SWE before fine-needle aspiration or surgery. The diagnostic performance was compared between US findings only and the combined use of US findings with 2D-SWE, which were correlated with pathology results.
Results: Receiver-operating characteristic curve analysis was performed to assess the diagnostic performance of 2D-SWE. Conventional US findings and 2D-SWE values were analyzed and compared between benign and malignant thyroid nodules. The mean values of SWE_mean, SWE_min, and SWE_max were 46.6±16.7, 26.2±9.5, and 73.6±18.1 kPa, respectively, in PTMC, which were significantly higher than those in benign tumors (27.8±12.4, 15.8±8.6, and 50.3±22.6 kPa, P<0.001). The optimal cut-off values of SWE_mean, SWE_min, and SWE_max for predicting malignancy were 34.5, 21.8, and 53.2 kPa, respectively. Taller than wide, micro-calcification, and SWE_mean were found to be independent risk factors for predicting PTMC. The overall sensitivity, specificity, accuracy, positive predictive value, and negative predictive value of combined conventional US features with 2D-SWE parameters were 95.7%, 94.5%, 94.9%, 89.8%, and 97.7%, respectively; these were superior to those of conventional US (89.1%, 90.1%, 89.9%, 82.0%, and 93.2%).
Conclusion: The study indicates that the quantitative parameters of 2D-SWE are an independent predictive factor for diagnosing PTMC, which could provide valuable information when conventional US cannot give determinate results.

Keywords: shear wave elastography, thyroid nodule, malignancy, diagnostic performance

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