Sonographic Diagnosis of Parotid Gland Lesions: Correlation with the Results of Sonographically Guided Fine-Needle Aspiration Biopsy

Purpose. The aim was to assess the value of ultrasound (US) in differentiating benign from malignant parotid gland lesions. Methods. During a 3-year period, US-guided fine-needle aspiration biopsy was performed on 89 parotid lesions with a size >= 5 mm in 68 patients. In 80 (90%) lesions, specimens were adequate for cytologic analysis. We recorded the seven following US parameters: size, number, echogenicity, echotexture, margins' clarity, distal acoustic enhancement, and regional lymph node enlargement. Results. Fine-needle aspiration biopsy revealed 18 (22%) malignant tumors, 30 (38%) benign tumors, and 32 (40%) nonneoplastic lesions. The mean size of the malignant tumors was 25 17 mm versus 27 +/- 17 mm for benign tumors versus 21 12 mm for nonneoplastic lesions (p > 0.05). Among 33 solitary tumors, 9 were malignant tumors and 24 were benign tumors. The majority of the parotid lesions were hypoechoic. The US feature that was most often associated with a benign lesion was distal acoustic enhancement. The US features that suggested malignancy were a heterogeneous echotexture, indistinct margins, and regional lymph node enlargement. Conclusion. US can aid in the differentiation of parotid gland tumors, although benign and malignant parotid tumors often have a similar sonographic appearance. (C) 2010 Wiley Periodicals, Inc. J Clin Ultrasound 38:294-298, 2010; Published online in Wiley InterScience (www.interscience.wiley.com). DOI: 10.1002/jcu.20704