Whether mastectomy for intraductal breast cancer also requires lymph node dissection mainly depends on whether the cancer cells have metastasized to the axillary lymph nodes. Clinical treatment of breast cancer usually focuses on surgical tumor removal, which is generally divided into breast-conserving surgery and total mastectomy. Axillary lymph node dissection is not compulsory for all breast cancer surgeries, such as in situ cancer or sentinel lymph node-negative breast cancer, axillary lymph node dissection can be avoided. Axillary lymph node dissection is more extensive and can cause a certain degree of trauma to the patient and may lead to upper extremity lymphedema. In the early stage, breast cancer patients can also choose to diagnose and treat the sentinel lymph nodes. If the pathology report of the sentinel lymph nodes is negative, the lymph node dissection can be avoided for the time being, and only need to be reviewed regularly. If the sentinel lymph nodes are diagnosed as positive, patients need to undergo axillary lymph node dissection. Patients with intraductal carcinoma mastectomy should choose whether to have lymph node dissection correctly according to their own situation under the advice of doctors.