We welcome patients who come for “minimally invasive biopsy” and also for “minimally invasive surgery” for benign lumps, so let me give you a brief introduction to the McMurdo system for minimally invasive biopsy of breast lumps. It is a biopsy device, and from a biopsy point of view, it can take more specimens than other devices (such as hollow core needles, fine needles), and it is well known that the more specimens, the higher the pathological accuracy. Compared to surgical biopsies (with sufficient volume of specimens), the incision is smaller. So, from a biopsy point of view, “the only disadvantage is that it is expensive”. In terms of treating the disease (removing the mass), one must first understand how it works. The device is operated only under ultrasound monitoring, and the ultrasound is used to guide the biopsy or removal of the “mass”. The device is operated with a hollow-core bimetallic sheath-like needle with a groove at the front of the outer sheath to facilitate lump insertion, and an inner sheath that moves back and forth to cut off the tissue stuck in the outer sheath (the inner sheath is rotating during the process, a concept known as “spinotomy”), and then “strikes” A strip of tissue (specimen diameter about 3 mm, length about 25 mm, similar to a section of meat), a substantial mass is “beaten out” one by one by repeatedly moving the endosheath in and out under ultrasound guidance with a needle-like object. As for vacuum-assisted suction, it means that blood and tissue fluid can be suctioned at the same time during the operation, so as to avoid unclear field of view (mainly the ultrasound monitoring picture), not to “suck off” the tumor as people think, because the tumor is not liquid and cannot be sucked off. Rotational resection refers to the relative activities of the inner and outer sheaths, not the “knife” rotating around the periphery of the tumor to remove it. If the tumor is malignant, the doctor will only use McMurdo to complete the biopsy, not surgery. Why? Because the resection of malignant tumor is about “completeness”, it is not safe to cut into strips; secondly, it is about “residual rate”, the residual of malignant tumor will lead to recurrence. Doctors will not take this risk.