Role of fine needle aspiration in malignant parotid tumors at a single-center experience: A retrospective cohort study

Abstract

Background: Parotid gland tumors are mostly benign with good prognosis. On the other hand, malignant tumors of the parotid gland often have poor prognosis and metastasize. Mucoepidermoid carcinoma is the most common cancer in the parotid gland accounting for nearly 40–50% of the cases. Therefore, it is important to define the role of fine needle aspiration in differentiating between different types of parotid malignancies. Method: This is a retrospective chart review study that was done on 49 consecutive patients who underwent parotid surgeries in King Fahad Armed Forces Hospital in Jeddah, Saudi Arabia, between Jan 2003 and Feb 2020. The records of 49 patients were obtained, fine needle aspiration and pathology reports were reviewed to define the role of fine needle aspiration in diagnosing malignant parotid tumors by calculating the sensitivity, specificity, positive predictive value, and negative predictive value. Results: Retrospective analysis of 39 cases revealed that there was one case which was diagnosed for cancer was missed by fine needle aspiration. Meanwhile, six cases were diagnosed as malignant lesions using both fine needle aspiration and histopathology. Furthermore, 30 cases were determined benign based on fine needle aspiration and histopathology. The sensitivity of fine needle aspiration for detecting malignancy was 85.7%, specificity was 93.8%. positive predictive value of 75% and negative predictive value of 96.7%. Conclusion: Fine needle aspiration is highly sensitive and specific for parotid tumors. We support the role of pre-operative FNA for all parotid tumors as its accurate in differentiating between benign and malignant lesions.