Microcalcifications are tiny specks of mineral deposits (calcium), that can be scattered throughout the mammary gland, or occur in clusters.They can also be found in the prostate in men and lead to prostatic hyperplasia. When found on a mammogram, a radiologist will then decide whether the specks are of concern - usually, this is not the case. Commonly, they simply indicate the presence of tiny benign cysts, but can signify the presence of early breast cancer; for this reason, it is important to attend regular screening sessions, as recommended by your health service.