Although the primary purpose of periodic mammograms in screening programs is to
identify lesions suspected of being carcinomas, the findings are often related
to systemic (benign or malignant) diseases, rather than breast cancer. Although
the involvement of breast structures in systemic diseases is unusual, it can be
included in the differential diagnosis of masses, skin changes, calcifications,
asymmetry, and axillary lymphadenopathy. The main diagnostic entities that can
be associated with such involvement are diabetes, chronic kidney disease, heart
diseases, connective tissue diseases, HIV infection, lymphoma, leukemia, and
metastases from primary tumors at other sites. In many cases, information
related to knowledge and treatment of chronic diseases is not available to the
radiologist at the time of evaluation of the mammography findings. The purpose
of this essay is to offer relevant pictorial information to the general
radiologist about systemic diseases involving the breast, expanding the range of
differential diagnoses in order to avoid unnecessary invasive procedures.