In recent years, the incidence of benign and malignant breast tumors in women worldwide has shown a significant upward trend, and breast cancer has become the first malignant tumor in women in terms of morbidity and second in terms of mortality; women’s pursuit of beauty has also put forward higher requirements for breast surgery, and how to remove breast lesions while minimizing the impact on breast appearance has become the goal pursued by breast surgeons. Early detection and early treatment of breast tumors is the key to improve the survival rate of patients, and tissue biopsy is an important means of confirmation. The commonly used clinical lesion biopsy methods are: open surgical biopsy, fine needle aspiration biopsy, coarse needle biopsy with hollow core needle, and McMurdo puncture biopsy. Open surgical biopsy of clinical breast lesions has been the conventional method in the past, allowing complete excision of the mass and providing sufficient tissue volume for pathologic diagnosis. However, it may leave significant scarring and disfigure the aesthetics of the breast. Compared to surgical biopsy, fine-needle aspiration cytology is a safe and minimally invasive puncture method, but it only provides a cytologic diagnosis with a low positive rate and a certain rate of missed diagnoses. hollow-core coarse needle biopsy, which emerged in the 1980s, has the same advantages as fine-needle aspiration cytology in terms of simplicity, safety, and minimally invasiveness, but most importantly, it can obtain large tissue samples and provide a more reliable histologic diagnosis. The McMurdo is a computer-controlled, vacuum-assisted, high-speed spinotomy device for minimally invasive treatment or biopsy of breast masses (tumors) under the stereotactic guidance of ultrasound or molybdenum-palladium. The system consists of a vacuum suction pump and a rotary cutter head. The rotary cutter head is similar in diameter to a hollow biopsy needle and consists of a trocar needle coupled with vacuum suction and has a special transfer device. Without exiting the jacket, the excised specimen is transported out of the body by the movement of the inner sleeve needle for pathological histological diagnosis. Compared with traditional surgery, it has the following features: 1. Precise localization and accurate excision of lesions With the widespread use of high-frequency color Doppler ultrasound imaging technology, the detection of small breast masses is increasing, and the characterization and excision of small breast masses that cannot be found clinically has become a new difficulty in contemporary breast surgery. The traditional surgical approach is to surgically remove the lesion with the help of imaging localization, which sometimes results in missed or wrong incision, or requires extensive excision. Compared with the traditional way of blind cutting by hand, its accuracy is high, and the tiny calcified foci of the breast that cannot be shown by B ultrasound can be removed under the monitoring of digital mammography. 2.Small incision, good cosmetic effect The incidence of breast lumps, especially multiple lumps, is increasing year by year, which is related to the change of diet, life rhythm and environment. Traditional open surgery is associated with more incisions, more scars, and a higher incidence of changes in breast appearance, causing many young women to delay seeking treatment. Compared to the 3-5 cm incision of traditional surgery, the incision of McMerton surgery is only 3-5 mm, no sutures are needed and no scars are left; moreover, multiple lesions on the same side of the breast can be removed through one incision (less than 3, distance not more than 10 cm). It avoids cutting through the skin, subcutaneous tissue and normal glands, with little tissue damage and fast recovery, which is especially advantageous for deep breast masses and obese patients. 3.High-tech design ensures safety Unique hollow puncture needle design, only one puncture throughout the operation, avoiding needle tract transfer caused by repeated multiple punctures of tumor cell shedding. 4.More accurate diagnosis The biopsy of suspicious lesions can obtain large and continuous specimens, and the sample volume taken in one puncture is 8 times of the traditional hollow needle, which reduces the false negative rate of pathology by 50% (malignant tumor cells are not detected and misdiagnosed as negative due to the small volume and limitation of the specimen); moreover, marker clips can be placed at the biopsy site to observe whether the lesions have malignant changes at any time. 5.Low infection rate, more economical Conventional surgical incision application of electrocoagulation to stop bleeding is likely to cause fat liquefaction, and surgical sutures are retained in the incision as foreign bodies, which are likely to cause incision infection and poor healing; McMurdo surgery has little damage to normal tissues and no foreign bodies remain in the body, which significantly reduces the risk of infection and saves the cost of anti-infection. 6.Fast and convenient surgery Short operation time, light pain, can be operated in outpatient clinic, single swelling 10-30 minutes, and can move freely after surgery. The McMurdo rotary excision system is suitable for benign breast masses less than 3 or 5 cm, fibroadenoma, nodules, asymmetric density, multifocal lesions and microcalcifications as well as breast masses (<3 cm) with unknown pathological nature that require excisional biopsy. Patients with suspected breast cancer can be biopsied, but rotational excision of the mass should be avoided; patients with bleeding tendency, hemangioma and diabetes mellitus are contraindications to surgery. If the lump is located in the areola and the diameter is >3 or 5 cm, the lump rotation surgery should be performed with caution. So far, this technique has more than 10 years of clinical experience and more than 2 million clinical procedures worldwide, and its safety and reliability are fully recognized by the world breast surgery field.