BI-RADS (Breast imaging reporting and data system) is the American College of Radiology’s recommended “Breast Imaging Reporting and Data System”, which is more standardized. The significance of each grade is as follows: Grade 0: Recall for re-evaluation in conjunction with other tests. Indicates that the information obtained from the exam may be incomplete. Grade I: No abnormality is seen. Grade II: Benign changes are considered and regular follow-up (e.g., annually) is recommended. Grade III: Benign disease is possible, but shorter follow-up intervals (e.g., once every 3 to 6 months) are needed. The percentage of malignancy at this level is less than 2%. Grade IV: Abnormalities are present and the possibility of malignant disease cannot be completely ruled out; a biopsy is required for clarification. Grade IVa: low likelihood of predisposition to malignancy. Grade IVb: moderate likelihood of malignancy. Grade IVc: high likelihood of malignancy. Grade V: Highly suspicious of malignant lesions (almost recognized as malignant disease), requiring surgical excision biopsy. Grade VI: has been confirmed by pathology as a malignant lesion. So when you get the hospital’s mammogram, ultrasound and MRI reports, diagnosed with breast changes BI-RADS how many grades, first do not need to be nervous, do not think that the report BI-RADS the so-called grade I, grade II is the stage I, stage II of breast cancer. In fact, only after grade III need to be treated with caution. Of course, the degree of breast disease judged from the imaging needs to be analyzed by the clinician in the context of the specific situation before giving diagnosis and treatment recommendations.