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Use of BI-RADS Category Subdivisions Feasible for Screening Breast MRI

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Background: The American College of Radiology (ACR) Breast Imaging -- Reporting and Data System (BI-RADS) categorization scheme includes subdivisions for BI-RADS category 4, which further defines the likelihood of malignancy. Although BI-RADS category 4 implies a likelihood of malignancy ranging from 2% to 95%, the subcategories help to stratify the radiologist's suspicion for malignancy. For BI-RADS category 4A, the suspicion for malignancy is 2% to 10%; for category 4B, it is 10% more...
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