![]() BI-RADS categories, originally established for mammography, are classified as normal (BI- RADS 1), benign (BI-RADS 2), probably benign (BI-RADS 3), suspicious (BI-RADS 4), highly suggestive (BI-RADS 5), or known malignancy (BI-RADS 6). The American College of Radiology (ACR) Breast Imaging Reporting and Data System (BI-RADS) is used to classify breast imaging studies to indicate the level of suspicion for malignancy for any given study. However, MR imaging assessment also incorporates additional information such as water content (T2 signal intensity) and kinetic analysis. This approach involves the analysis of lesion morphology, distribution, and symmetry. ![]() Therefore, the approach to categorizing findings on breast MR imaging as probably benign has been borrowed primarily from principles used in the evaluation of mammographic lesions. Compared with the well-established criteria for assessing a mammographic or sonographic finding as probably benign, the data describing the appropriate use of the probably benign category on MR imaging are limited. The use of the probably benign category for lesions detected on breast magnetic resonance (MR) imaging is not standardized. Short-term follow-up may also be appropriate for areas of benign-appearing focal nonmass enhancement that probably represent variations of the normal background enhancement. The most appropriate uses of a probably benign assessment on MR imaging include benign-appearing foci that are unique and distinct from the background enhancement or masses typical of incidental benign fibroadenomas. ![]() The use of BI-RADS 3 for classically benign findings (ie, chronic cysts, classic fat necrosis, intramammary lymph nodes, and multiple bilateral similar benign-appearing masses) should be avoided. A BI-RADS (Breast Imaging Reporting and Data System) 3, or probably benign, assessment is given in approximately 7% to 12% of breast magnetic resonance (MR) images.Īs with mammography and ultrasonography, a BI-RADS 3 assessment should be used only when there is a less than 2% likelihood of malignancy.
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