"Breast masses are three-dimensional space-occupying lesions in the breasts. This article provides an overview of the standard BI-RADS terminology used to describe breast masses in radiology reports and other reporting suggestions."
"Breast masses are described differently by modality according to the BI-RADS lexicon 1-4. In all modalities, masses can be described by their size, location, and shape:"
"shape, which can be remembered by the mnemonic ROI:"
"focal asymmetry on mammography, which is seen on at least two views but does not have convex borders"