Breast BI-RADS (Breast imaging reporting and data system) grading is the standard used in the Breast Imaging Reporting and Data System (BI-RADS), created and recommended by the American College of Radiology (ACR), to indicate breast changes. The meaning of the BI-RADS grading is as follows: Grade 0: requires recall and re-evaluation in conjunction with other examinations, indicating that the information obtained from the examination may not be complete. Grade I: No abnormality is seen. Grade II: benign changes are considered and regular follow-up (e.g., once a year) is recommended. Grade III: Benign disease is possible, but a shorter follow-up period (e.g., once every 3-6 months) is needed, and the percentage of malignancy at this level is less than 2%. Grade IV: malignant lesion is considered possible and requires biopsy for clarification. Grade V: Highly suspicious of malignant lesion (almost identified as malignant disease), requiring surgical excisional biopsy. Grade VI: Malignant lesion has been confirmed by pathology. So when you get the report of mammogram, ultrasound and MRI from the hospital, how many grades of breast alteration BI-RADS are diagnosed, there is no need to be nervous first, do not think that the report BI-RADS so-called grade I and II is the stage I and II of breast cancer. In fact, only grade III onwards needs to be treated with caution. Of course, the degree of breast disease judged from the imaging needs to be analyzed by clinicians in a comprehensive manner before giving treatment recommendations.