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Table 1 BI-RADS US assessment categories

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

Assessment

Management

Category 0: incomplete—need additional imaging evaluation

Recall for additional imaging

Category 1: negative

Routine screening

Category 2: benign

Routine screening

Category 3: probably benign

Short-interval (6 months) follow-up or continued surveillance

Category 4: suspicious—biopsy

Tissue diagnosis

 Category 4A: low suspicion for malignancy

 Category 4B: moderate suspicion for malignancy

 Category 4C: high suspicion for malignancy

Category 5: highly suggestive of malignancy

Tissue diagnosis

Category 6: known biopsy-proven malignancy

Surgical excision when clinically appropriate