Ultrasound and mammography are generally recommended to be performed 4-7 days after menstruation, when the premenstrual engorgement of the breast subsides, which is the period that can best reflect the true condition of the breast, and this period is more accurate, especially for benign tumors. Ultrasound and mammography results are generally classified into 6 levels: ultrasound and mammography BI-RADS level 1 normal breast gland, including breast hyperplasia, which is basically considered normal and has a very low risk of breast cancer and generally does not require special treatment, only regular annual review; ultrasound and mammography BI-RADS level 2 and 3 benign breast tumors or nodules, including benign solid or cystic nodules or If a patient has a benign tumor or nodule of grade BI-RADS 4A, the nature of the tumor is to be determined (benign or malignant cannot be distinguished, but benign is likely to be large), which may contain a small percentage of atypical early breast cancer. Ultrasound mammography BI-RADS grade 4B and C breast masses of malignant nature are not excluded, in which case the malignancy may be about 50-90%, requiring immediate inpatient surgery and not suitable for observation; Ultrasound mammography BI-RADS grade 5 breast masses of malignant nature may be large, in which case they are basically considered malignant and require immediate inpatient surgery; Ultrasound mammography BI-RADS grade 6 has obtained a pathological diagnosis of breast cancer.