Biatrial cardiac myxoma.

A routine abdominal sonography study detected a round mass in the right atrium of a 66-year-old man, who was then transferred to our hospital for further evaluation. On physical examination, the patient appeared healthy, with no signs of discomfort or heart failure. Cardiac auscultation revealed normal heart sounds with a mild respiratory-dependant systolic murmur at the apex. Laboratory studies did not detect any significant abnormalities. Electrocardiogram (ECG) showed sinus tachycardia of 100 bpm and an incomplete right bundle branch block with a QRS duration of 0.10 sec. Transthoracic echocardiography showed a round homogeneously echogenic mass of 30 X 20 mm in the right atrium, which was adjacent to the interatrial septum. Left ventricular diameters and function were normal. No diastolic prolapse of the mass into the right ventricle was detected. The left atrium was not entirely visible, and further studies were suggested to exclude tumor in the left atrium. We performed an ECG-triggered cardiac magnetic resonance imaging (MRI) examination on a standard Siemens Expert Magnetom 1.0-T scanner with gradient-