Breast Imaging Reporting and Data System (BI-RADS)
The Breast Imaging Reporting and Data System (BI-RADS) is a standardized system to describe mammogram findings and results. Developed by the American College of Radiology (ACR), results of mammograms are sorted into categories numbered 0 through 6 with interpretation as follows:
Category 0: Additional imaging evaluation and/or comparison to prior mammograms is needed.
Category 1: Negative.
Category 2: Benign (noncancerous) finding.
Category 3: Probably benign finding—Follow-up in a short time frame is suggested.
Category 4: Suspicious abnormality—Biopsy should be considered.
Category 5: Highly suggestive of malignancy—Appropriate action should be taken.
Category 6: Known biopsy-proven malignancy—Appropriate action should be taken. ■
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