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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 CATEGORY | DEFINITION |
|---|---|
| 1 | Normal mammogram. The patient should return in 1 year for annual mammography. |
| 2 | Benign finding on mammogram. The patient should return in 1 year for annual mammography. |
| 3 | There 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. |
| 4 | A biopsy is warranted: >2% but <95% likelihood of malignancy. |
| 4a | Low likelihood of malignancy. |
| 4b | Intermediate likelihood of malignancy. |
| 4c | Moderate likelihood of malignancy. |
| 5 | A biopsy is recommended. There is a high likelihood of malignancy (≥95%). |
| 6 | Confirmed malignancy. |
| 0 | The imaging evaluation is incomplete. Additional evaluation or prior studies are needed for comparison. |
