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Definition. Breast calcifications are calcium deposits within breast tissue. They appear as white spots or flecks on a mammogram and are usually so small that you can't feel them. Breast calcifications are common on mammograms and they're especially prevalent after menopause.n a mammogram, breast calcifications can appear as macrocalcifications or microcalcifications. 1  Macrocalcifications. 2  These show up as large white dots or dashes. 3  They're almost always noncancerous and require no further testing or follow-up.
Calcifications can also occur in the glandular tissue where milk is produced (the lobules) and in the ducts that carry milk to the nipple. Even when you're not pregnant or breastfeeding, the lobules secrete small amounts of calcium-containing fluid. If that calcium crystallizes, it may show up on a mammogram.enign breast calcifications can form as a response to injury. When any part of the breast is damaged â by surgery, radiation, trauma, infection, or a cyst â fat cells die, releasing fatty acids that combine with calcium to form deposits.