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Breast Imaging-Reporting and Data System. A quality assurance system and lexicon originally designed for reporting mammography results from patients with breast cancer, and published as an atlas by the American College of Radiology. The BI-RADS Atlas is a peer-reporting (i.e., not for lay or patient use) tool which now includes three imaging modalities: mammography, ultrasound and MRI.

There is considerable variability in the correct interpretation of mammograms among radiologists—there is a moderate agreement among radiologists in reporting an abnormal finding when cancer is present (kappa = 0.52) and substantial agreement when cancer is not present (kappa = 0.62); BI-RADS was designed by the American College of Radiology (ACR) to provide the verbal uniformity to be used in descriptions of mammogram results, required for data submission to the ACR National Mammography Database (NMD), and to ensure concise reporting of breast-imaging findings among various practitioners and specialties.

On dictation, there may be reference to an ACR, a BI-RADS or an ACRBI-RADS classification or category related to findings. These are:
1 or N: normal;
2 or B: benign;
3 or P: probably benign;
4 or S: suspicious ;
5 or M: malignant.

BI-RADS Assessment Categories
0: Incomplete;
1: Negative;
2: Benign finding(s);
3: Probably benign;
4: Suspicious abnormality;
5: Highly suggestive of malignancy;
6: Known biopsy—proven malignancy.

Breast Composition Categories
1: Almost entirely fat;
2: Scattered fibroglandular densities;
3: Heterogeneously dense;
4: Extremely dense.
References in periodicals archive ?
B-CAD is an excellent training and teaching tool for anyone beginning in breast imaging; it clearly shows the interaction of features we use everyday to classify breast lesions and should help spread the adoption of the breast-imaging standards the American College of Radiology Breast Imaging Reporting and Data System (BI-RADS) Committee has created," stated Dr.
Mendelson is Co-Investigator of the ACRIN Protocol 6666 Study and a member of the American College of Radiology Breast Imaging Reporting and Data System (BI-RADS) Committee.
This development occurred years before the American College of Radiology Accreditation Program, the American College of Radiology Breast Imaging Reporting and Data System (much of which was based on our approach), and before passage of the Mammography Quality Standards Act (MQSA).