MRI and CT Imaging Characteristics in Parotid Tumors with False-Negative Fine-Needle Aspirations

Abstract

Backgrounds: Preoperative imaging, particularly with MRI and CT, plays a crucial role in distinguishing between benign and malignant parotid gland tumors, while the reliability of fine-needle aspiration (FNA) in diagnosing these masses remains a topic of debate. Methods: Retrospective study involving 347 patients who underwent both FNA and preoperative imaging. Various imaging parameters were analyzed and statistically evaluated. Results: Irregular shape and invasion were significantly associated with malignancy, even in patients with benign or unsatisfactory FNA results. False-negative FNA diagnosis rate was 10.6%. Conclusion: Radiological imaging focusing on specific features can aid in differentiating benign from malignant parotid tumors, especially when FNA results are inconclusive. This can guide treatment decisions and the need for additional procedures such as frozen biopsies.