Understanding BI-RADS 4 on Your Mammogram: Subcategories and Next Steps

BI-RADS (Breast Imaging Reporting and Data System) standardizes mammogram reporting. Category 4 means a suspicious abnormality requiring further evaluation—could be a mass, calcifications, or other findings.

Subcategories

• 4A: Low suspicion (<2% cancer risk); further evaluation recommended.
• 4B: Moderate suspicion (2–10% risk); additional imaging (ultrasound/MRI) often advised.
• 4C: Intermediate suspicion (10–50% risk); biopsy typically recommended.

BI-RADS 4 does not mean cancer. It indicates need for investigation. Discuss results with your radiologist and primary/OB-GYN to determine next steps (imaging follow-up or biopsy).