Intraductal papilloma, atypical hyperplasia can be treated by surgical removal of the tumor tissue. Intraductal papillomas are benign tumors occurring in the breast, while atypical hyperplasia is a lesion between benign and malignant, a neoplastic lesion that has not yet progressed to cancer but has a risk of progressing to invasive breast cancer that is about five times higher than that of the general population. Surgical treatment is the mainstay after diagnosis, and solitary papillomas should be removed from the diseased ductal system. Preoperatively, methylene blue can be injected along the diseased ducts to correctly localize and excise the ducts and surrounding breast tissue. Pathologic examination should be done routinely after surgery, and if there is malignancy, appropriate surgery should be performed. Those who are diagnosed with intraductal papilloma with atypical hyperplasia should be treated under the guidance of specialized physicians.