In the posterior-superior aspect of the right breast on the mlo view, there is a 5 mm spiculated nodular density for which additional imaging with spot compression is recommended in the mlo and exaggerated craniocaudal lateral projections. The remainder of the right breast parenchymal pattern is stable. At mammography, breast cancer frequently manifests as an ill-defined or spiculated mass, with or without associated calcifications, or as architectural distortion, focal asymmetric density, or calcifications. At ultrasonography, breast cancer may show up as mass with internal structures or increased vascularity. however ductal or lobular breast carcinoma can also cause asymmetric breast tissue density. In the absence of an actual mass, breast cancer is quite unlikely, but follow-up imaging is necessary, so dont quit having mammograms. Often, an ultrasound will be the next step, and if ultrasound finds nothing, or finds cysts, that is good news. breast asymmetry is a common characteristic for women, and is often no cause for concern. However, if the size of your breasts change or the density variation becomes larger over time, these. in cases of breast cancer, a spiculated mass usually exists on the periphery of the breast, not the center, and is typically discovered through ultrasonography or a mammogram, which is a screening that uses radiation to create images of breast tissue. if there is a difference in breast density, then it is called focal asymmetry or breast asymmetry. For breast asymmetry that is new, it is referred to as a developing asymmetry. A mammogram that identifies a developing symmetry could likely mean that there is a chance, approximately 12. the term asymmetric breast tissue refers to a greater volume or density of breast tissue in one breast than in the corresponding area in the contralateral breast (,,, fig 1). Although asymmetry is often a normal finding, additional evaluation may sometimes be required ( , 2 ). breast asymmetry refers to when one breast is a different size or shape than the other. A mammogram or breast cancer screening may show asymmetrical breast size or density.