A Case of Cardiac Mobile Mass That Was Diagnosed as Detached Calcified Mitral Annulus

Takehiro Kubota＊

Yasushige Shingu＊＊

（Department of Cardiovascular Surgery, NHO Hakodate National Hospital＊, Hakodate, Japan, and Graduate School of Medicine, Hokkaido University＊＊, Sapporo, Japan）

The case was a 77-year-old woman with a history of coronary artery bypass surgery 9 years earlier. After the surgery, aortic stenosis appeared and gradually progressed. During follow-up, she presented with a high degree of mitral annular calcification（MAC). A mobile verrucous mass in the left ventricle attached to the calcified posterior mitral annulus. We replaced the aortic valve and resected the mass（size, 3×26mm). The mass with a club-shape was hard but fragile. Pathological examination revealed that it was a calcified substance without cell components covered with a thin membrane. Immunostainings with CD31 and Factor VIII-related antigen, a vascular endothelial cell marker, were both positive. Thus, the resected mass was diagnosed as a detached calcified mitral annulus. In order to avoid embolic events, early resection would be appropriate for an MAC-related mobile mass.

 

Jpn. J. Cardiovasc. Surg. 50:184-187（2021）

Keywords：mitral annular calcification（MAC）;cardiac mobile tumor