BI-RADS is the system used to assess the risk and quality of breast lesions. It is used in ultrasonography, mammography, and MRI. According to BI-RADS, there are 7 classifications: - BI-RADS 0: incomplete. Further imaging is required. - BI-RADS 1: no masses or calcifications - BI-RADS 2: benign lesion; 0 % risk of malignancy - BI-RADS 3: <2% risk of malignancy - BI-RADS 4: 2-94% risk of malignancy - BI-RADS 5: > 95% risk of malignancy - BI-RADS 6: known case of malignancy Reference: https://radiopaedia.org/articles/breast-imaging-reporting-and-data-system-bi-rads Image via: https://www.ijpsonline.com/articles/difference-analysis-of-sensitivity-of-birads-classification-of-breast-mass-with-different-pathological-types-3716.html