Nipple overflow is one of the main symptoms of breast disease visits, and sometimes even a clinical manifestation of breast cancer, and is valued by clinicians. Breast ductoscopy, also known as microfiber electronic breast duct endoscopy, is the first choice for the diagnosis of the cause of nipple overflow. The advantages of breast ductoscopy are: 1) it is a non-invasive examination operation; 2) it can be performed under direct vision, which makes the indication of surgery clear for patients with ductal neoplasm disease with nipple overflow but no lumps, and also eliminates surgery for patients with symptoms such as ductal dilatation; 3) it provides three-dimensional surgical positioning, clarifies the site and scope of surgery, and improves the accuracy and success rate of surgery. The scope of surgery can be narrowed. For example, the distance from the nipple to the cancer lesion in the breast duct can be correctly determined; 4. With the development of clinical medicine, lactoscopy will create favorable conditions for the application of laser technology to directly remove tumors in the milk ducts. The scope of application of breast ductoscopy: 1.Provide patients with clinical manifestations of nipple discharge with direct visual inspection to understand the situation in the duct cavity and grasp the surgical indications; 2. The lactoscopic copper wire locates the tumor lesion and accurately removes the lesion. 3, for suspicious lesion duct cytology examination, clear diagnosis, can avoid some unnecessary surgical trauma. 4, lactation duct irrigation for inflammatory diseases such as lactodilatation and ductitis, and can achieve certain therapeutic effect static image records. 5, treatment of lactodynia and other diseases, the lactoscope can be used to lavage the lesion duct, and can inject drugs into the duct. Treatment