Categories of BI-RADS scales and management recommendations

AssessmentManagementProbability of malignancy
BI-RADS 0: not conclusiveAdditional tests are requiringN/A
BI-RADS 1: normal breastRoutine mammography screeningEssentially 0%
BI-RADS 2: benignRoutine mammography screeningEssentially 0%
BI-RADS 3: probably benignRequires semestral follow-up by two years≤ 2%
BI-RADS 4: probably malignantBiopsy required> 2% and < 95%
BI-RADS 4A: low suspicionBiopsy required> 2% and ≤ 10%
BI-RADS 4B: moderate suspicionBiopsy required> 10% and ≤ 50%
BI-RADS 4C: high suspicionBiopsy required> 50% and ≤ 95%
BI-RADS 5: highly suggestive of malignancyBiopsy required≥ 95%
BI-RADS 6: histologically confirmed malignancySurgical excision when clinically appropriateN/A

N/A: not applicable