Interpret ACR BI-RADS categories. 0 = incomplete; 1 = negative; 2 = benign; 3 = probably benign (<=2% malignancy); 4 = suspicious (2-95%); 4A/4B/4C subcategories; 5 = highly suggestive malignancy (>=95%); 6 = known biopsy-proven.
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