Objective:To analyze the full-field digital mammography(FFDM) findings in mastitis and differentiation of mastitis from breast cancer.Methods:39 cases of mastitis underwent mammography confirmed by surgical pathology were analyzed.Results:Of the 39 cases,26 were chronic mastitis,5 were plasma cell mastitis and 8 were granulomatous mastitis.The mammography showed mass in 17 cases,localized asymmetric density in 20 cases,focal architectural distortion in 2 cases,lymph modes consolidation in 7 cases,localized skin thickening in 12 cases,and indentation of nipple in 7 cases.Conclusion:Mammographic findings in combination with clinical manifestications will be helpful in improving diagnostic accuracy of mastitis.