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Thyroid gland tumor diagnosis at US elastography.
Andrej Lyshchik1, Tatsuya Higashi, Ryo Asato
1Department of Nuclear Medicine and Diagnostic Imaging, Otolaryngology-Head and Neck Surgery, and Therapeutic Radiology and Oncology, Kyoto University Graduate School of Medicine, Sakyo-ku, Kyoto 606-8507, Japan. lyshchik@kuhp.kyoto-u.ac.jp
Radiology
|August 25, 2005
Summary
Ultrasonographic elastography shows promise for differentiating thyroid tumors. A strain index greater than 4 accurately predicts malignancy, aiding in thyroid cancer diagnosis.
Area of Science:
- Medical Imaging
- Oncology
- Diagnostic Ultrasound
Background:
- Thyroid gland tumors require accurate differentiation between benign and malignant types.
- Ultrasonographic elastography offers a non-invasive method to assess tissue stiffness.
Purpose of the Study:
- To evaluate the elastographic features of thyroid tumors.
- To determine the sensitivity and specificity of ultrasonographic elastography in distinguishing benign from malignant thyroid lesions.
Main Methods:
- Prospective evaluation of 52 thyroid lesions in 31 patients using real-time and off-line elastography.
- Analysis of lesion visibility, brightness, margin regularity, and calculation of thyroid gland-to-tumor strain ratio (strain index).
- Statistical analysis including univariate and multivariate logistic regression.
Main Results:
- A strain index > 4 was the strongest predictor of malignancy (82% sensitivity, 96% specificity).
- Real-time elastography criteria showed lower sensitivity despite high specificity.
- Off-line processed elastograms provided more robust indicators for malignancy.
Conclusions:
- Ultrasonographic elastography is a valuable tool for the differential diagnosis of thyroid cancer.
- Strain index measurement is a key parameter for improving diagnostic accuracy.