Objective:To explore the diagnosis and treatment of mammary duct ectasia.Methods:The clinical data of 96 cases of mammary duct ectasia were analyzed retrospectively.Results:The main clinical manifestations were as follows:breast mass(40 cases,41 .67%),abscess (26 cases,27.08%),nipple retraction (64 cases,66.67%),nipple discharge (25 cases,26.04%),breast fistula (30 cases,31.25%).The rate of misdagnosis before operation was 46.88%(45/96),of which 22 cases (22.97%) were diagnosed as breast cancer.All cases un...