This definition appears somewhat frequently
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Mitral annular calcification (MAC) is a common degenerative process involving the fibrous annulus of the mitral valve. It is generally an incidental finding associated with aging, although it occasionally is prominent enough to cause significant left
Jeon DS, Atar S, Brasch AV, Luo H, Mirocha J, Naqvi TZ, Kraus R, Berman DS, Siegel RJ: Association of mitral annulus calcification, aortic valve sclerosis and aortic root calcification with abnormal myocardial perfusion single photon emission tomography in subjects age < or =65 years old. J Am Coll Cardiol 2001, 38(7):1988-1993. PubMed Abstract | Publisher Full Text.