Breast Imaging Reporting and Data System (BI RADS)

What is Breast Imaging Reporting and Data System (BI RADS)?

The Breast Imaging Reporting and Data System (BI-RADS) lexicon was developed by the American College of Radiology (ACR) to provide a clear, concise way to report mammographic results. A BI-RADS category is reported at the end of every mammogram report and summarizes the findings of the mammogram.

BI RADS Lexicon

BI-RADS CATEGORYDEFINITION
1Normal mammogram. The patient should return in 1 year for annual mammography.
2Benign finding on mammogram. The patient should return in 1 year for annual mammography.
3There is a high likelihood of benignity (>98%). A short-term follow-up is recommended in 6 months. The follow-up is performed over a total of 2-3 years.
4A biopsy is warranted: >2% but <95% likelihood of malignancy.
4aLow likelihood of malignancy.
4bIntermediate likelihood of malignancy.
4cModerate likelihood of malignancy.
5A biopsy is recommended. There is a high likelihood of malignancy (≥95%).
6Confirmed malignancy.
0The imaging evaluation is incomplete. Additional evaluation or prior studies are needed for comparison.
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