A calcified amorphous tumor (CAT) of the right atrium (RA) is an exceedingly rare non-neoplastic cardiac mass. It was initially described in 1997 and only a handful of cases has been published so far. We present a case of tumor in 77-year-old male, in the RA that attached to the rim of the fossa ovalis, with classic pathological and clinical findings. Under cardiopulmonary bypass (CPB) and bicaval and aortic cannulation and cardioplegic arrest, right atrial mass, was resected and septal defect was repaired with a fresh pericardial patch. Pathological exam of the mass revealed CAT. The patient had an uneventful hospitalization and his blue discoloration of finger recovered normally.