The Value of Ultrasound-Guided Fine-Needle Aspiration Cytology by Cytopathologists in the Diagnosis of Major Salivary Gland Tumors

Because of the typical sonographic appearances of many salivary gland masses, as well as the normal appearance and anatomy of the glands, differentiation of salivary glands tumors based only on clinical and imaging criteria is difficult. We compared the utility, safety, specificity, and accuracy of ultrasound-guided fine needle aspiration cytology ( UG-FNAC) in the detection of nonpalpable tumors in the major salivary glands. A retrospective review was done of a 5-year experience of 102 consecutive patients undergoing UG-FNAC. Clinical opinion, FNA results, and final pathologic findings were examined. Histological evaluation showed 29 malignant tumors and 54 benign lesions ( neoplasms and nonneoplastic lesions). The cytologic findings were nondiagnostic in 19 cases (18.6%), true negative in 50 (49%), true positive in 20 (19.6%), false negative in 9 (8.8%), and false-positive in 4 (3.9%) cases for detecting malignant tumors. Six of 20 (30%) malignant tumors ( true positive) and 41 of 50 (82%) benign lesions ( true negative) were classified accurately. The accuracy, sensitivity, and specificity were 84.3%, 68.9%, and 92.6%, respectively. Ultrasound guided FNAC was found to be highly specific for malignancy and its sensitivity for malignancy was good. It is a reliable and accurate diagnostic technique with minimal complications and easy to perform with high specificity 92.5% ( 95% CI: 82.09%-97.90%). It should be the preferred primary approach for initial investigation in diagnosing salivary gland tumors.