Purpose: To determine which sonographic findings usefully differentiate between benign and malignant papillary tumors. Materials and Methods: We retrospectively rev i ewed the ultrasonographic findings of 42 surgically proven cases of papillary breast lesions [11 malignant lesions (7 inva s i ve papillary carcinomas, 4 intraductal papillary carcinomas) and 31 benign intraductal papillomas]. All 42 cases were classified sonographically as cystic or ductal, or solid type, and the shape, wall change, margin, internal echo-pattern, posterior echo change and other associated findings for the two types were then analysed.

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