Vascular pattern and spectral parameters of power Doppler ultrasound as predictors of malignancy risk in thyroid nodules
Abstract
Background: Thyroid nodules are common clinical finding by palpation. Thyroid nodule should be evaluated to exclude the presence of a thyroid malignant lesion Evaluation of the thyroid nodules are depending on history, physical examination, fine needle aspiration cytology and also imaging studies. Objective: This study was aimed to evaluate the role of spectral Doppler ultrasound parameters, including resistance index (RI) and vascular pattern in distinguishing malignant from benign thyroid nodules. Methods: 120 patients with thyroid nodules were selected from our patients attending Al-zahra hospital in Isfahan. We prospectively evaluated 120 thyroid nodules in patients undergoing surgery. For each nodule the flow pattern were measured by power Doppler and then ranked on a scale of 0 to 4 as follows: absent, perinodular alone, mixed with perinodular prominence, mixed with intranodular prominence and exclusively intra nodular, respectively. RI value was also recorded. Pathological examination were used as a proof of final diagnosis to categorize all nodules as benign or malignant. The data collected in check list then the data analyzed by with SPSS v21. Results: The mean age in patients was 45.4414.3 years. vascularity of nodules increased the risk of malignancy of nodules and also malignant nodules had more peripheral vessels (P-value<0.001). Resistive index (RI) was significantly higher among malignant nodules (0.73 vs. 0.61; P-value<0.0001).Conclusion: presence of peripheral vessels pattern and RI assessed by power Doppler Ultra Sound examination could be beneficial in evaluation of thyroid nodules.
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