Contribution of Sonoelastography to Diagnosis in Distinguishing Benign and Malignant Breast Masses.

ABSTRACT

OBJECTIVES: The purpose of this study was to investigate the contribution of strain index measurements and a 5-point scoring method to diagnostic accuracy in differential diagnosis of benign and malignant solid breast masses and to compare the diagnostic performances of both methods. METHODS: Eighty female patients were included in this study. Before biopsy, all patients underwent ultrasound (US) and sonoelastographic examinations. The elastographic images of lesions were assessed according to the 5-point scoring method, and then elasticity scores were determined. Strain values of the masses and subcutaneous adipose tissue were measured. The diagnostic efficacies of B-mode US, sonoelastographic 5-point scoring, and strain index methods were compared with histopathologic findings. RESULTS: The mean age of the patients ± SD was 42 ± 13 years (range, 14-81 years). In histopathologic evaluations, 59 (74%) lesions were diagnosed as benign, and 21 (26%) were diagnosed as malignant. The mean strain index values were 10.45 ± 7.04 (range, 3.4-25.1) in malignant lesions and 2.88 ± 2.5 (range, 0.5-19.81) in benign lesions. The mean strain index for malignant lesions was significantly higher than that for benign lesions (P < .05). The highest sensitivity was found for B-mode US, and the highest specificity was found for the strain index. The diagnostic performance of the strain index was higher than that of the 5-point scoring method. CONCLUSIONS: The addition of a sonoelastographic examination to B-mode US prevents unnecessary biopsies. The strain index was found to be superior to the 5-point scoring method to a limited extent.