It is a minimally invasive breast surgery that is performed with a special rotary knife under ultrasound surveillance to remove breast lumps (tumors) or biopsy and finally send them for pathological examination (frozen section + conventional paraffin section). So far, the minimally invasive breast surgery has more than 10 years of clinical experience and more than 2 million cases worldwide. Compared with traditional surgery, it is less invasive, safe, reliable, time-saving and easy to perform, and is fully recognized in the field of breast surgery. In addition, multiple lesions on the same side of the breast can be removed through one incision, avoiding the need for multiple incisions in traditional surgery, especially for deep breast masses and obese patients. At the same time, the diagnosis is more accurate. Biopsies of suspicious lesions under ultrasound positioning can obtain large and continuous specimens, and the sample volume taken in one puncture is eight times that of the traditional hollow thick needle, which improves the accuracy of pathological diagnosis. Comprehensive clinical practice, the McMurdo procedure is suitable for benign breast masses less than 2.5 cm, fibroadenomas, nodules, asymmetric density, multifocal lesions and microcalcifications, as well as breast masses of unknown pathological nature that require excisional biopsy. It is especially recommended for the following groups of people: 1. unmarried, infertile and non-lactating women; 2. scarred body; 3. those who wish to have a better breast appearance; 4. those with early detection of lesions of unknown nature; 5. those with nodules in the breast and a heavy burden on the patient’s mind. Of course, patients with clear breast cancer should avoid McMurdo surgery; patients with bleeding tendency and hemangioma are contraindications to surgery, and if the lump is located around the areola, McMurdo surgery should be performed with caution. Precautions for McMurdo surgery: 1. Avoid the week before menstruation and menstrual period as much as possible. 2, postoperative precautions: (1) postoperative pressure bandage is required for 2-3 days; keep the wound clean and dry after surgery, generally 2-3 times of drug changes within a week after surgery is appropriate; generally about 7 working days after surgery, receive the pathology report, according to the pathology results to do follow-up treatment and follow-up. (2) If there is any discomfort such as fever, bleeding from the wound, local swelling or significant pain after surgery, please come to the hospital in time; if there is local bruising after surgery, please do not be nervous, usually the bruising can completely subside after 2 weeks; for some patients with large lesions, there may be mild skin depression after surgery, which will generally recover in about one month and will not affect the beauty. Do not lift heavy objects and avoid strong upper extremity movements for 1 month on the affected upper extremity. (3) Benign lesions have the possibility of recurrence. Self-check once after each menstrual period and regular outpatient follow-up in 3-6 months. Ultrasound examination is feasible after six months.