The American College of Radiology (ACR) is the copyright owner of a work entitled Breast Imaging Reporting and Data System (BI-RADS), which contains a guide to standardized mammographic reporting, including a breast-imaging lexicon of terminology, a report organization and assessment structure and coding system. The Third Edition includes the latest BI-RADS revision along with statistical definitions and explanation for performing a mammography audit. At present, imaging modalities used as diagnostic adjuncts to mammography such as ultrasound (US) and magnetic resonance (MR) are not classified using BI-RADS. Imaging techniques classified as investigational by the FDA have not been considered in developing the BI-RADS system.
BI-RADS Assessment Categories:
Category 0: Need Additional Imaging Evaluation
Category 1: Negative
Category 2: Benign Finding
Category 3: Probably Benign Finding; Short Interval Follow-Up Suggested
Category 4: Suspicious Abnormality; Biopsy Should Be Considered
Category 5: Highly Suggestive of Malignancy; Appropriate Action Should Be Taken