Ultrasound of the breast can examine whether there is a lump in the breast, whether the lump is solid or cystic, and whether the breast ducts are dilated. It can also help to identify lumps that are benign or malignant based on their boundaries, shape, blood flow and measurement of blood flow parameters. Breast ultrasound can also examine the axillary lymph nodes and make a preliminary judgment on whether the lymph nodes have metastasized. It can also check whether there is a parametrium in the axilla or whether the parametrium produces a lump, etc. All these can be examined by ultrasound. For many patients who are post-operative breast cancer patients, depending on the type of surgery performed, the doctor will have specific requirements for the time of review. For breast cancer patients, ultrasound can check whether there are recurrent metastatic lesions in the breast, and whether there are postoperative hematomas and postoperative effusions. For patients who have undergone radical mastectomy, ultrasound can also check whether there are recurrent foci in the lateral chest wall after surgery and whether there are lymph node metastases in the axilla.