Abstract: This study investigated the diagnostic efficacy of two-dimensional ultrasound and shear wave elastography (SWE) in parotid space-occupying lesions. Choosing 80 patients with parotid space-occupying lesions to compared the ultrasonic characteristics and Young’s modulus between malignant and benign tumors. The pathological results confirmed 29 cases of parotid gland malignant tumors and 51 cases of benign. In ultrasonic features, the proportions of lobulated, incomplete capsule and unclear boundary of parotid gland malignant tumors were significantly higher than those of benign tumors (P<0.05). The sensitivity, specificity, accuracy of ultrasound in the diagnosis of parotid gland malignant tumors were 79.31%, 60.78%, 67.50%, respectively. In benign tumors, the maximum and average young’s modulus of mixed tumors were significantly higher than those of adenolymphoma (P<0.05). The area under the ROC curve of the maximum and average Young’s modulus to distinguish parotid gland mixed tumor and adenolymphoma were 0.768 and 0.759, P<0.05. Two-dimensional ultrasound has certain application value in differentiating benign and malignant tumors of parotid glands. Although SWE cannot distinguish benign and malignant tumors, it is more effective in distinguish mixed tumors and adenolymphoma among benign tumors.

Key words: two-dimensional ultrasound, shear wave elastrography, space-occupying lesion of parotid gland, diagnostic efficiency