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• W2080343370 abstract "Background: No conventional imaging method reliably distinguishes between benign and malignant thyroid nodules. Our objectives were to characterize the enhancement patterns of thyroid nodules on gray-scale contrast-enhanced ultrasound (US) and to evaluate whether these patterns were useful in the differential diagnosis of thyroid nodules. Methods: Ninety-five patients, scheduled for surgery for thyroid nodules detected by gray-scale sonography, were enrolled in this prospective study. In all, there were 104 nodules (47 papillary carcinomas, 3 medullary carcinomas, 1 metastatic carcinoma, 44 hyperplasia nodule, 7 follicular adenomas, 1 suture granulomas, and 1 Hashimoto's disease). After intraveneous (i.v.) injection of a 1.2 mL bolus of SonoVue, lesions were scanned with real-time gray-scale pulse inversion harmonic imaging US for at least 3 minutes at low mechanical index (MI) (0.05 to 0.08). The enhancement patterns were classified into one of four patterns by two experienced readers. Results: After administration of SonoVue, four enhancement patterns (homogeneous, heterogeneous, ring-enhancing, and no enhancement) were observed. Four benign and 3 malignant nodules had homogeneous enhancement pattern, 4 benign and 45 malignant nodules had heterogeneous enhancement, 44 benign and 3 malignant nodules had ring enhancement, and 1 benign nodule had no enhancement. There was a significant difference between benign and malignant nodules (p < 0.001). The benign thyroid nodules showed four enhancement patterns: ring enhancement 44/53 (83.0%), homogeneous enhancement 4/53 (7.5%), heterogeneous enhancement 4/53 (7.5%), and no enhancement 1/44 (1.9%). The malignant thyroid nodules showed three enhancement patterns: heterogeneous enhancement 45/51 (88.2%), ring enhancement 3/51 (5.9%), and homogeneous enhancement 3/51 (5.9%). Ring enhancement correlated highly with a benign diagnosis (sensitivity 83.0%, specificity 94.1%, positive predictive value 93.6%, negative predictive value 84.2%, and accuracy 88.5%). Heterogeneous enhancement correlated highly with a malignant diagnosis (sensitivity 88.2%, specificity, 92.5% positive predictive value 91.8%, negative predictive value 89.1%, and accuracy 90.4%). In both mixed and solid nodules, ring enhancement was highly predictive of a benign finding, whereas heterogeneous enhancement was highly predictive of a malignant finding. Conclusions: Contrast-enhanced US enhancement patterns were different in benign and malignant lesions. Ring enhancement was predictive of benign lesions, whereas heterogeneous enhancement was helpful for detecting malignant lesions." @default.
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• W2080343370 date "2010-01-01" @default.
• W2080343370 modified "2023-10-10" @default.
• W2080343370 title "Utility of Contrast-Enhanced Ultrasound for Evaluation of Thyroid Nodules" @default.
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• W2080343370 doi "https://doi.org/10.1089/thy.2009.0045" @default.
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