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Research ArticleHEAD & NECK

Can Quantitative Diffusion-Weighted MR Imaging Differentiate Benign and Malignant Cold Thyroid Nodules? Initial Results in 25 Patients

C. Schueller-Weidekamm, K. Kaserer, G. Schueller, C. Scheuba, H. Ringl, M. Weber, C. Czerny and A.M. Herneth
American Journal of Neuroradiology February 2009, 30 (2) 417-422; DOI: https://doi.org/10.3174/ajnr.A1338
C. Schueller-Weidekamm
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K. Kaserer
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G. Schueller
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C. Scheuba
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H. Ringl
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M. Weber
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C. Czerny
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A.M. Herneth
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Abstract

BACKGROUND AND PURPOSE: The characterization of cold nodules of the thyroid gland is mandatory because approximately 20% of these nodules are of malignant origin. The purpose of this study was to evaluate the distinction of cold thyroid nodules by using quantitative diffusion-weighted MR imaging (DWI).

MATERIALS AND METHODS: In 25 patients with cold nodules on scintigraphy and suggestive findings at fine-needle aspiration, thyroid carcinoma was suggested. In these patients, cold nodules and the normal parenchyma of the contralateral thyroid lobe were prospectively investigated with quantitative DWI (echo-planar imaging sequence; maximum b-value, 800 s/mm2) before surgery. The differences in the mean apparent diffusion coefficient (ADC) values in benign and malignant nodules were tested by using a Mann-Whitney U test.

RESULTS: Histologically, there were 20 carcinomas with a minimum size of 8 mm and 5 adenomas. The mean ADC values (in 10−3 mm2/s) differed significantly among carcinoma, adenoma, and normal parenchyma (P < .05). The ranges (95% confidence interval) of the ADC values for carcinoma (2.43–3.037), adenoma (1.626–2.233), and normal parenchyma (1.253–1.602) showed no overlap. When an ADC value of 2.25 or higher was used for predicting malignancy, the highest accuracy of 88%, with 85% sensitivity and 100% specificity, was obtained.

CONCLUSIONS: Quantitative DWI seems to be a feasible tool with which to differentiate thyroid carcinomas from adenomas; however, further studies are required including larger numbers of patients to confirm our results.

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American Journal of Neuroradiology: 30 (2)
American Journal of Neuroradiology
Vol. 30, Issue 2
February 2009
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Cite this article
C. Schueller-Weidekamm, K. Kaserer, G. Schueller, C. Scheuba, H. Ringl, M. Weber, C. Czerny, A.M. Herneth
Can Quantitative Diffusion-Weighted MR Imaging Differentiate Benign and Malignant Cold Thyroid Nodules? Initial Results in 25 Patients
American Journal of Neuroradiology Feb 2009, 30 (2) 417-422; DOI: 10.3174/ajnr.A1338

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Can Quantitative Diffusion-Weighted MR Imaging Differentiate Benign and Malignant Cold Thyroid Nodules? Initial Results in 25 Patients
C. Schueller-Weidekamm, K. Kaserer, G. Schueller, C. Scheuba, H. Ringl, M. Weber, C. Czerny, A.M. Herneth
American Journal of Neuroradiology Feb 2009, 30 (2) 417-422; DOI: 10.3174/ajnr.A1338
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