Table 1.

American College of Radiology Breast Imaging-Reporting and Data System (BI-RADS) assessment categories. Each imaging report is assigned a category between 0 and 6, the definitions of which are demonstrated in this table

BI-RADS	Description
Category 0	Incomplete—need additional imaging evaluation (and/or prior mammograms for comparison)
Category 1	Negative
Category 2	Benign
Category 3	Probably benign
Category 4	Suspicious
Category 5	Highly suggestive of malignancy
Category 6	Known biopsy-proven malignancy