Surgery for breast nodule class 4A is usually still troublesome because class 4A breast nodules are more serious. The degree of difficulty of surgery depends on whether the patient’s breast nodule is benign or malignant, and cannot be generalized. 1. Benign nodule: If the patient’s breast nodule ultrasound classification is 4A, it is likely to be a benign tumor. Local anesthesia is usually used to remove the breast nodule and part of the breast gland, followed by frozen pathology. The procedure does not usually take long to perform and is usually completed in about an hour. 2. Malignant nodule: If the intraoperative pathology result suggests that the breast nodule is malignant, it is usually necessary to change the anesthesia mode and perform a general anesthesia procedure. Breast-conserving or radical mastectomy is feasible. The operation time is long and the damage is big, and the need for adjuvant treatment such as radiotherapy or chemotherapy will be decided according to the results of the pathological examination after the operation. Breast nodule category 4A, it is recommended to go to the regular hospital in time to clarify the diagnosis and standardize the treatment, so as not to delay the condition.