Nipple discharge is one of the three most common symptoms of breast disease and is found in approximately 3-8% of women during routine breast examinations. In 12% of cases of breast cancer with nipple discharge, the breast lump is not palpable, and in 10% of cases, the mammogram is negative. Ductoscopy, also known as electronic breast fiberoptic endoscopy, has now replaced mammography as the preferred means of diagnosing the cause of nipple discharge. It is easy to operate, less invasive, intuitive, and effectively improves the diagnosis rate of augmented lesions in the milk ducts, and can also be used with the treatment of benign milk duct lesions, such as minimally invasive mastectomy of diseased milk ducts assisted by mammography, treatment of plasmacytoid mastitis, and localization of tumor guide wires in the milk ducts. 1, ductoscopy object: to nipple overflow as the primary symptom of the consultation, accounting for 3% to 14% of breast diseases, the incidence of breast lumps and breast pain is second only. 2.What treatment can be done by ductoscopy? (1) Milk duct lavage, cytological examination, clear diagnosis, and can achieve certain therapeutic effects. (2) For diseases such as plasmacytoid mastitis, the diseased milk ducts are irrigated and injected with antibiotics and other drugs. (3) The use of lactoscopic mesh baskets to remove large pieces of flocculent material or to unblock the milk ducts. (4) Lactoscopic crochet to locate neoplastic lesions and remove them accurately. (5) Lactoscopy assisted minimally invasive excision of diseased milk ducts. (2) The examination can be performed under direct vision, which can be used as a basis for clinical diagnosis, making the indication of surgery clear for patients with breast disease manifested by nipple overflow without finding a lump, and eliminating surgery for patients with symptoms such as duct dilatation only; at the same time, providing a reliable basis for early diagnosis of breast cancer; (3) providing (3) Three-dimensional surgical positioning, which clarifies the site and scope of surgery, improves the accuracy and success rate of surgery, and reduces the scope of surgery. (4) With the help of mammoscopic instrument access, some surgical and examination instruments can directly enter the mammary duct lumen, for example, the cytobrush can be used to remove cells from the lesion site (no longer obtaining cell samples by aspirating the luminal fluid) for cytological examination, and instruments (such as mesh baskets) can be used to remove single benign spur tumors and complete some local surgeries. (5) 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 procedure of mammary ductoscopy is to insert a 0.75mm (0.6mm or 0.95mm) diameter endoscope through the mouth of the breast duct, and to probe the end of the breast duct through the medical monitor while observing the situation inside the breast duct, as far as the fourth or fifth level of the breast duct branch. The entire procedure takes about 10-15 minutes and is performed under local anesthesia without significant discomfort to the patient. The endoscopic examination of breast ducts can clearly observe the situation of breast duct walls and ductal secretions, and describe the color, size, shape, smoothness, etc. if there is an occupying lesion. Breast ductal carcinoma, intraductal papilloma, and ductal inflammation each have their characteristic endoscopic manifestations of the breast ducts, and thus can be diagnosed accordingly.