With the improvement in medical care and awareness of health care, more and more women with breast disease are having mammograms, and the report often includes the words calcified foci. Calcified foci are deposits of calcium in the breast that are detected on mammograms. Calcified foci in the breast can vary in size, benignity and malignancy; large calcified foci are often benign lesions in the breast, such as arterial calcification in the breast tissue, old injuries and inflammation, and generally do not require special treatment. Small foci of calcification, on the other hand, are usually areas of rapid cell growth and division. If there are multiple localized foci of fine calcification clustered together, it indicates the possible presence of small breast cancer lesions. Half of the breast cancers detected by mammogram show small clusters of calcifications in the breast.