Mammography is an examination, not a surgery. Also known as an electronic breast fiberoptic endoscopy, the electronic breast fiberoptic endoscopy is now widely used in breast surgery for the detection of breast diseases and has replaced mammography as the first choice for the diagnosis of nipple discharge etiology. Electronic breast fiber endoscopy is similar to electronic colonoscopy and laparoscopy, and is a minimally invasive surgical examination. This test plays an important role in clarifying the diagnosis of breast disease and the location of the lesion, and in formulating a surgical approach, especially in patients with nipple discharge and dilated milk ducts. However, since the thickness of the milk ducts varies from person to person, patients with thin milk ducts need to dilate the milk ducts first and then perform the examination. If not done properly, it may cause some damage to the breast ducts. Therefore, it is important to go to a regular hospital and under the operation of a specialized doctor for a breast ductoscopy.