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Table 1 BI-RADS US assessment categories

From: Breast lesions in women under 25 years: radiologic-pathologic correlation

Category 0: incomplete—need additional imaging evaluationRecall for additional imaging
Category 1: negativeRoutine screening
Category 2: benignRoutine screening
Category 3: probably benignShort-interval (6 months) follow-up or continued surveillance
Category 4: suspicious—biopsyTissue diagnosis
 Category 4A: low suspicion for malignancy
 Category 4B: moderate suspicion for malignancy
 Category 4C: high suspicion for malignancy
Category 5: highly suggestive of malignancyTissue diagnosis
Category 6: known biopsy-proven malignancySurgical excision when clinically appropriate