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©2013 UpToDate ® Print Email BI-RADS mammographic assessment categories Assessment category Recommendation Probability of malignancy 0: Incomplete Need for further evaluation Not applicable 1: Normal Normal interval follow-up 0 percent 2: Benign Normal interval follow-up 0 percent 3: Probably benign A short interval follow-up is recommended <2 percent 4: Suspicious abnormality A biopsy should be considered ≥2 to <95 percent (a) Low-risk (b) Intermediate-risk (c) Moderate to high-risk 5: Highly suggestive of malignancy Biopsy or surgery should be performed ≥95 percent 6: Biopsy-proven carcinoma Appropriate action should be taken BI-RADS: Breast Imaging Reporting and Data System. Source: Breast Imaging Reporting and Data System (BI-RADS) Atlas. 4th Edition. American College of Radiology, Reston, VA, 2003