mi·cro·cal·ci·fi·ca·tion 
(mī′krō-kăl′sə-fĭ-kāshən)
(mī′krō-kăl′sə-fĭ-kāshən)n.
A tiny, nonpalpable deposit of calcium in breast tissue that is visible on a mammogram, can be scattered or clustered, and can indicate either cancer or benign tissue changes.