Nonmass Lesions on Breast Ultrasound: Interreader Agreement and Associations With Malignancy

BACKGROUND. Nonmass lesions (NMLs) on breast ultrasound lack clear definition and encompass a broad range of benign and malignant entities. Given the anticipated inclusion of NMLs in the BI-RADS 6th edition, a thorough understanding of these lesions will be critical for their optimal management.