A Waving Horn on the Big Mitral Annulus Calcification: Caseous Calcification of the Mitral Annulus with Abscess Formation

Caseous calcification of the mitral annulus (CCMA) is a rare variant of mitral annular calcification. It comprises a combination of calcium, fatty acids, and cholesterol, and is characterized by heterogeneity in echocardiographic images, with peripheral areas of calcification surrounding a central area of echolucency, resembling a periannular mass. Here, we describe a case of CCMA combined with a mitral annulus abscess, manifesting as a waving, horn-like structure. Although the image characteristics of the posterior mitral annulus suggested CCMA, additional findings warranted further work-up and studies.