Surgery for mitral annular caseous calcification-related calcified amorphous tumor: a case report

BACKGROUND: A calcified amorphous tumor (a non-neoplastic tumor) with caseous calcification of the mitral annulus is a rare pathology that causes severe embolic events. We present a rare case of mitral valve surgery for a mitral annular caseous calcification-related calcified amorphous tumor found in cerebral infarction. CASE PRESENTATION: A 69-year-old man was diagnosed with a mitral valve calcified amorphous tumor with mitral annular caseous calcification found in cerebral infarction. He was admitted because of acute multiple embolic cerebral infarctions. A search for the embolic source through transesophageal echocardiography revealed a mitral valve tumor raised from the posterior mitral valve leaflet on the side of the left ventricle. Computed tomographic cardiac angiography revealed a calcified mitral valve tumor invading the posterior mitral valve annulus and left ventricular muscle. Intraoperative findings revealed a mitral annular calcification-related calcified amorphous tumor with caseous calcification of the posterior leaflet and annulus, which was suspected. Therefore, we performed radical debridement of the mitral annular calcification and bioprosthetic mitral valve replacement with patch repair of the posterior mitral valve annulus 2 weeks after the onset of cerebral infarction. The patient recovered well post operation, without any embolic events. CONCLUSIONS: A calcified amorphous tumor with caseous mitral annulus calcification may be highly associated with embolic events. In this case, mitral valve replacement with annular patch repair may be a favorable procedure for preventing embolic events.