Dilatation of breast ducts does not always require a mammography, but a large dilated area will need to be examined by doing a mammography. Whether or not ductal dilatation needs to be examined by mammography depends on the condition of the patient. If the dilated area is small and the dilatation is simple, it usually does not need to be examined by mammography. However, if the dilatation area is large and a tumor is considered to be present in the ducts, it is necessary to perform a mammography to better understand the nature of the tumor. Ductal dilatation can also be visualized by breast ultrasound, ductoscopy, mammography, MRI, and puncture pathology. If the cause of ductal dilatation is a tumor, the tumor needs to be surgically removed, and after the removal, the next step in the treatment is based on the pathology. Patients with dilated breast ducts should go to the hospital in time, and the doctor will choose the appropriate examination methods according to the examination.