For mammography, Dr. Tao believes that breast ultrasound is the preferred method of examination. The classification of the assessment after breast ultrasound is very important, and it is one of the important references for our surgeons to develop the next step of the treatment plan. (1) The assessment is incomplete. BI-RADS 0: Further evaluation with other imaging studies (such as mammography or MRI) is needed. (2) Assessment is complete BI-RADS 1: Negative. No positive clinical signs and no abnormalities on ultrasound imaging, e.g., no masses, no structural distortions, no skin thickening and no microcalcifications. BI-RADS 2: Benign lesions. Basically, malignant lesions can be excluded. Six to 12 months follow-up is feasible depending on age and clinical presentation. For example, simple cysts, breast prosthesis, lipomas, intramammary lymph nodes (which can also be classified as category 1), postoperative changes in benign lesions with no change in images on multiple reexaminations, and nodules with documented little change in images after multiple examinations may be fibroadenomas. BI-RADS 3: Possible benign lesions. Short-term (3~6 months) review and other further examinations are recommended. BI-RADS 4: suspicious malignant lesion. This class of lesions has a 2% to 95% chance of malignancy. Assessment of category 4 means that histopathological examination is recommended: fine needle aspiration cytology, hollow core needle aspiration biopsy, and surgical biopsy to provide a cytological or histopathological diagnosis. Currently, they can be classified as 4A, 4B, and 4C. category 4A is more likely to be benign, and fibroadenomas that are not certain, intraductal lesions with nipple overflow or blood spillage, and inflammatory mammary glands that are not clear can be classified in this category, with a malignancy compliance rate of 2% to 10% for this category; category 4B is difficult to clarify based on sonograms, with a malignancy compliance rate of 10% to 50% for this category; category 4C suggests a higher likelihood of malignancy The compliance rate of such malignancy is 50%~95%. BI-RADS 5: highly likely to be malignant, appropriate diagnostic and management measures should be actively taken. Lesions with obvious malignant features on ultrasound sonograms are classified in this category and have a malignant probability greater than or equal to 95%, and should be started for aggressive treatment with percutaneous aspiration biopsy (usually image-guided hollow-core needle aspiration biopsy) or surgery. BI-RADS 6: Has been biopsy-proven malignant. This category is used for imaging evaluation where the biopsy has confirmed malignancy but treatment has not yet been performed. The main purpose is to evaluate imaging changes after prior biopsy or to monitor imaging changes from neoadjuvant chemotherapy prior to surgery.