SO SÁNH GIÁ TRỊ CỦA THANG ĐIỂM ĐÀN HỒI 5-POINT VÀ 4-POINT TRONG PHÂN BIỆT LÀNH VÀ ÁC TÍNH CỦA U TUYẾN NƯỚC BỌT MANG TAI

Abstract

Background: Ultrasound elastography is an important adjunctive tool in the differential diagnosis of salivary gland tumors. Currently, the effectiveness of the 5-point and 4-point scoring systems in distinguishing benign from malignant parotid gland tumors remains a subject of debate. Objectives: To compare the 5-point and 4-point elastography scoring systems in differentiating benign and malignant characteristics of parotid gland tumors. Materials and methods: This was a cross-sectional descriptive-analytic study conducted on 34 patients with parotid gland tumors who underwent surgery and had histopathological confirmation at Hue University of Medicine and Pharmacy Hospital from June 2023 to October 2024. Results: The mean age was 57.38 ± 12.94 years, with a male-to-female ratio of 1:1. Regarding tumor classification, malignant tumors accounted for 14.7% and benign tumors for 85.3%. Among benign cases, Warthin’s tumor was the most common subtype (35.3%). The study found that the 4-point scoring system demonstrated better discriminatory ability between benign and malignant lesions, with an AUC of 0.70 compared to 0.64 for the Tsukuba 5-point system. At the cutoff value of 2.5, the 4-point system achieved higher specificity (93% vs. 83%) and a comparable negative predictive value (approximately 90%) compared to the 5-point system. However, both scoring systems exhibited low sensitivity and low positive predictive values. Conclusion: The 4-point ultrasound elastography scoring system demonstrates superior specificity in differentiating benign from malignant parotid tumors compared to the Tsukuba 5-point system. Nonetheless, due to its low sensitivity, elastography should be used as a supplementary diagnostic method rather than a replacement for histopathological examination.