Caseous annular calcification is best described as which statement?

• A. It is a common variant of annular calcification
• B. It is a rare variant of annular calcification
• C. It is not associated with systemic abnormalities
• D. It exclusively affects the aortic annulus

Answer: (B)

Caseous annular calcification is a rare variant of mitral annular calcification. It forms a calcified ring around the mitral annulus with a central caseous (liquefied) core, giving a distinctive appearance that sets it apart from typical MAC. This rarity within the spectrum of annular calcifications is what makes the statement describing it as a rare variant the best choice. It involves the mitral, not the aortic annulus, so a claim that it exclusively affects the aortic annulus isn’t accurate. While it is a localized degenerative process rather than a systemic problem, the defining point for this description is its rarity among annular calcifications.