Ultrasound of the breast - value of sonographic criteria for the differential diagnosis of solid lesions.

OBJECTIVE: The investigation of the value of sonographic criteria for the assessment of the character of solid breast lesions.
METHODS: 281 preoperative sonographic studies of breast lesions were analysed and classified according to the following features: characteristics of the contour, echodensity, echo pattern, posterior acoustic properties, mobility, compressibility, axis of the lesion, L/T ratio (longitudinal size divided by transverse size), and architecture of surrounding tissue. We assessed the differential diagnostic value of each feature based on frequency distribution and odds ratio (OR).
RESULTS: 152 (54.1 %) benign and 129 (45.9 %) malignant breast lesions were evaluated by ultrasound. The following sonographic criteria were the most clear-cut signs for lesions to be malignant: ill-defined borders (OR: 19.8), incompressibility (OR: 9.7), and discontinuity of Cooper's ligaments (OR: 4.8). Benign lesions were characterised by compressibility (OR: 0.12), smooth borders (OR: 0.12), and displacement of Cooper's ligaments (OR: 0.24).
CONCLUSION: When distinguishing benign from malignant breast lesions, ultrasound examiners should be primarily guided by the lesion's contour and compressibility and the architecture of the surrounding tissue. Aiming for the widest possible consensus on terminology issues and standardised interpretation of the above criteria would help to advance breast sonography from its current status as a supplementary technique to the status of the modality of choice for the early diagnosis of breast cancer.