1.What situation is not suitable for minimally invasive? Theoretically, due to the limitation of the length of the extraction slot (2.5cm), minimally invasive resection of tumors larger than 2.5cm in diameter is difficult, easy to lead to residuals and great damage; moreover, the volume of the tissue strip taken each time is relatively small, requiring more than ten or even dozens of cutting operations, and the rotary cutter is a disposable device, too many times of cutting will lead to blunting of the cutter head, which may need to be replaced with a new one during the operation, leading to increased costs. However, if individual patients strongly request it, after weighing the pros and cons and stating the advantages and disadvantages, excision can also be attempted. Tang Xin, Department of Breast Surgery, Beijing Maternity Hospital 2. What are the complications and preventive measures for minimally invasive surgery? Hematoma – a rare complication When the postoperative bandage is too loose or premature strenuous activity, it may lead to bleeding from the cavity after lumpectomy, forming a “hard bag” – hematoma. If the hematoma liquefies, it can be aspirated, but the solid clot can only be slowly absorbed 1-3 months after surgery. Petechiae – a common complication, mostly small petechiae. Petechiae are formed by the spread of bleeding along the subcutaneous loose tissue, which may or may not be accompanied by hematoma, and are mostly caused by strenuous postoperative activities or large damage due to the removal of more tumors during surgery. Preventive measures Try to reduce the activity of the arm on the operated side on the day of surgery and the next day to prevent the bandage from loosening and hematoma formation. Patients with a single mastectomy mass can engage in non-manual work 2 days after surgery. Patients with more masses removed need to take a week off work and can perform non-manual work one week after surgery. After discharge, you need to come to the hospital 1-2 times to change the medication according to the surgeon’s request.