The differences between benign and malignant breast ductal tumor include different growth rate, different appearance characteristics, whether it will metastasize or not, and different prognosis. 1. Different growth rate: benign ductal tumor grows slowly, while malignant ductal tumor grows quickly and easily forms large tumors. 2. Different appearance characteristics: benign ductal tumors have regular appearance and clearer boundary. Breast ductal tumor malignant has irregular shape, forming lobular or cauliflower-like appearance. 3. Whether it will metastasize or not: benign ductal breast tumor will not have metastatic growth and is not invasive. Malignant ductal breast tumor will have distant metastasis and invasiveness. 4. Different prognosis: benign ductal breast tumor is cured after surgical resection and has good prognosis. The cure rate of malignant breast ductal tumor is low, and the prognosis is obviously worse than that of benign tumor. It is suggested that patients with breast ductal tumor should go to the hospital in time, and under the guidance of the doctor, actively treat the tumor to avoid delaying the condition.