Figure 1. Schematic diagram of the preoperative ultrasonography (US)-guided surgical clip insertion. (A) The coaxial guiding needle with an inner stylet and surgical clips. (B) Under US-guidance (blue), the coaxial guiding needle (white) is inserted into the the center of the breast cancer (pink), and one or two clips (black) are passed through. The inner stylet (light blue) is reinserted for pushing the clip.