title: Role of ultrasound in the assessment of benignity and malignancy of parotid masses.
abstract: OBJECTIVE
  This study aimed to investigate the value of ultrasound in the identification of benign and malignant parotid masses.
  
  
  METHODS
  Data of 189 patients with parotid gland masses undergoing ultrasound-guided fine-needle aspiration (FNA), core biopsy or surgery were reviewed retrospectively and the presumed sonographic diagnoses were compared with the histopathology. The sensitivity, specificity and accuracy of sonographic diagnoses were assessed and the sonographic characteristics of those lesions, including shape, margin, echogenicity, echotexture and vascularization, were studied.
  
  
  RESULTS
  Of the 189 patients, the final pathological diagnosis included 18 malignant tumours and 171 benign masses; the presumed sonographic diagnoses showed 165 cases as benign and probably benign masses (11 cases were confirmed malignant, 154 cases benign) and 24 cases were diagnosed as probably malignant and malignant masses (7 cases were confirmed malignant, 17 cases benign). The sensitivity, specificity, positive predictive value, negative predictive value and accuracy of ultrasound for the diagnosis of parotid gland masses were 38.9%, 90.1%, 29.2%, 93.3% and 85.2%, respectively, and accuracy for malignant masses was 20%. The sonographic characteristics of parotid masses between benign and malignant lesions had no significant differences. The parotid gland masses in this study included pleomorphic adenoma, Warthin's tumour, retention cyst, haemangiomas, chronic granuloma, lymphoma, fibrolipoma, abscess, basal cell adenoma, oncocytoma, lymphatic tuberculosis, myoepithelioma, neurilemmoma, mucoepidermoid carcinoma, adenoid cystic carcinoma, alveolar soft part sarcoma and retinal blastoma (metastasis).
  
  
  CONCLUSIONS
  It is challenging to use sonography for differentiating between benign and malignant parotid gland masses. To make a definite diagnosis, ultrasound-guided FNA or core biopsy is advocated.
authors: Department of Medical Imaging, the Affiliated Hospital of Hainan Medical College, Haikou, China. wsz074@yahoo.com.cn
authors: S
authors: S
authors: Wu
authors: G
authors: G
authors: Liu
authors: R
authors: R
authors: Chen
authors: Y
authors: Y
authors: Guan
mesh_terms: D000235:Adenolymphoma / Q000098:blood supply / Q000000981:diagnostic imaging / Q000473:pathology; D008949:Adenoma, Pleomorphic / Q000098:blood supply / Q000000981:diagnostic imaging / Q000473:pathology; D000293:Adolescent; D000328:Adult; D000368:Aged; D001706:Biopsy; D018277:Carcinoma, Mucoepidermoid / Q000098:blood supply / Q000000981:diagnostic imaging / Q000473:pathology; D002648:Child; D002675:Child, Preschool; D005260:Female; D006391:Hemangioma / Q000098:blood supply / Q000000981:diagnostic imaging / Q000473:pathology; D006801:Humans; D007223:Infant; D008297:Male; D008875:Middle Aged; D010307:Parotid Neoplasms / Q000098:blood supply / Q000000981:diagnostic imaging* / Q000473:pathology; D012680:Sensitivity and Specificity; D014463:Ultrasonography; D055815:Young Adult