A 70-year-old woman underwent a computed tomo-graphic scan for assessment of fatty liver. Incidentally, a cardiac tumor with partial calcification and a diameter of 17 mm was discovered in the right atrium (Figure 1A). The patient was asymptomatic with no cardiac murmur. Chest radiography showed no sign of cardiomegaly, and electrocardiography showed normal sinus rhythm. Echocardiography revealed an immobile mass attached to the interatrial septum in the right atrium (Figure IB). Coronary angi-ography detected no arteries feeding the tumor. Because of the risk of pulmonary embolism and the necessity of differential diagnosis of malignancy, surgical excision was performed under cardiopulmonary bypass (Figure 1C). Pathology revealed a cardiac blood cyst containing bloody fluid and a calcium stone (Figure ID, IE).
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