Abstract: Objective To investigate the relationship of mammographic features and histological findings in BI-RADS 3 and 4.Methods 75 patients with 88 cases were studied, which were categorized as BI-RADS 3 and 4, retrospectivly.The correlation between mammographic features and pathological findings was analyzed statistically.Logistic regression was used to improve the analytical results.Results There was difference between benign and malignant tumors:lesion type, margin, form, calcification morphologic and lymph node status.Logistic regression further showed that there was significant difference of margin with the odds ratio(OR)1.859, 95% confidence interval(95%CI)1.032~3.347, and confidence coefficient(P=0.039).But, no difference was found in different mammary gland type, density, spiculation, different diameter groups, calcification and its distribution(all with P＞0.05).Conclusion BI-RADS category 3 and 4:differences exist in category, margin, form, calcification morphologic and lymph node status between benign and malignant tumors, especially in the margin of a lesion.

Key words: BI-RADS 3-4, Mammography, Pathological, Logistic Regression