Purpose : To evaluate the radiologic characteristics of axillary lymph nodes which are found on mediolateralablique (MLO) view of mammography and to assess their clinical significance. Materials and Methods : Weretrospectively evaluated 119 cases axillary lymph nodes on MLO view of 410 cases of mammography in 205 patientsregarding the size, bilaterality, number, grade of density, presence of central lucency, calcification of lymphnodes and presence of associated parenchymal pathologic lesions in breast. Results : Axillary lymph nodes on MLOview were demonstrated in 119 (29%) among 410 cases. Axillary lymph nodes (112 cases) in cases without breastparenchymal lesions or with benign breast lesions showed; unilaterality in 68 cases (61%), smaller than 1.5cm in100 cases (89%), lower density than breast parenchyma in 99 cases (88%), presence of central lucency in 99 cases(88%) and calcification in 3 cases (2.7%). Axillary lymph nodes (7 cases) in cases with breast cancer showed smallsize of less than 1.5cm in 4 cases (57%), absence of central lucency in 7 cases (100%) and iso-to higher densitythan breast parenchyma in 7 cases (100%). Conclusion : Axillary lymph nodes noted on MLO view of mammography, morethan 1.5cm in diameter, absence of central lucency and iso to higher density than breast parenchyma could besuggested as clinically significant.