Abstract:Objective: To study the sonogram characteristics of non-lactation chronic mastitis, provide the diagnosis proof for clinic. Methods: All the 46 cases were examined by ultrasound. The position, shape, internal echo, capsule, calcification and blood flow of the masses were observed. A retrospective analysis was performed. Results: Twenty cases were chronic suppurative mastitis, 19 cases were granulomatous mastitis, 7 cases were plasma cell mastitis. All were comfirmed by pathology. Chronic suppurative mastitis ultrasound images with large liquid echo area were its characteristics. Granulomatous mastitis images were echo disorders, occasionally small amounts of liquid zone. Plasma cell mastitis images were without features. In 46 patients, 31 were BI-RADS category 3, 13 were category 4, 4 were category 4C. Conclusion: By analyzing the sonogram characteristics of mammary lump, combination with clinical characteristics could improve the accuracy rate of diagnosis.