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This study will help to determine the diagnostic accuracy and summarize the recent evidence on this issue. INPLASY2020100096. INPLASY2020100096. As a novel ultrasound technique, superb microvascular imaging (SMI) can quickly, simply, and noninvasively study the microvascular distribution in the tumor and evaluate the microvascular perfusion. Studies suggested that SMI is helpful for the differentiation between benign and malignant parotid tumors. However, the results of these studies have been contradictory. Therefore, the present meta-ana