Abstract
Calcified amorphous tumor (CAT) is an extremely rare, nonproliferation tumor accompanied by calcification. We encountered a case of end-stage renal failure in which a cardiac CAT developed on the mitral annulus. A 70-year-old woman with a history of coronary intervention was referred to us for evaluation of coronary artery disease. Echocardiographic examinations showed mitral annular calcification (MAC) of the posterior mitral annulus and a high-echogenic mobile mass (10 mm in diameter) attached to the MAC. Interestingly, echocardiography performed 12 months before as well as six months before showed caseous calcification of the mitral annulus (CCMA) with no mobile mass. Echocardiographic examinations on admission indicated that the mobile mass was associated with the outer wall of the CCMA detected previously. The mobile tumor was surgically removed because of a high risk of distal embolization, and the diagnosis of CAT was histologically confirmed. The present case might highlight one possible process for developing a CAT.
