[A Cardiac Metastasis from Colorectal Cancer discovered due to Palpitation and Dyspnea:Report of a Case].

A 61-year-old woman presented to our hospital with complaints of palpitation, dyspnea, and complete atrioventricular block. A tumor filling the right atrium was detected by computed tomography (CT)and echocardiography. Since the symptoms were severe and there was a risk of sudden death due to pulmonary embolism, tumor resection was performed. Pathological results suggested that the tumor was well-differentiated metastatic adenocarcinoma originating from colorectal cancer. Since the tumor could not be completely removed, radiation therapy was performed after the operation. Cardiac metastases from colorectal cancer are relatively rare and are occasionally seen in autopsy cases, but infrequently in surviving cases. Regular follow-up is therefore required.