The detailed process of the Mammotome-assisted endoscopic breast-conserving surgery for case 1. (A) The edges of the tumor to be cut and the axillary border were marked. (B) The tissues in inferior margin of tumor were removed. (C) The fat was aspirated. (D) Endoscope and operating instruments were inserted into the subcutaneous space. (E) Tumor’s endoscopic image. (F) Resected specimens.