Abstract
Introduction Blood-filled cysts of the heart have been reported in infants by necropsy, but are rare in older children and adults. Bloodfilled cysts were usually found on the valvular endocardium and thought to have no clinical significance in previous reports. The optimal management of asymptomatic blood-filled cyst is not determined. We experienced an adult case of a bloodfilled cyst on the top of anterolateral papillary muscle, which was successfully removed without valvular damage. Case A 22-year-old man visited out-patient clinic for the evaluation and treatment of cardiac mass. The mass was found incidentally during the work up for intermittent chest pain at a secondary referral hospital. Physical examinations revealed blood pressure of 102/64 mmHg, a heart rate of 80 bpm, and a respiratory rate of 20 breaths/min. There were no thrills, murmur or abnormal sound on cardiac examination. Laboratory findings showed normal blood chemistry, blood
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