Movie clip S1. A. Short-axis transesophageal view. Cystic lesion in the right atrium attached to the interatrial septum. B. Transesophageal echo. Bronchogenic cyst attached to the interatrial septum.

Movie clip S2. A. Transthoracic view at the level of the aortic valve. Infiltration of the right ventricular outflow tract and pulmonary valve with the tumor. B. Transesophageal short-axis view at the level of aorta. Tumor mass occupies the main pulmonary artery and contains blood channels. C. Transesophageal short-axis view at the level of aorta. Blood channels in the tumor mass with blood flow.

Movie clip S3. A. Parasternal right ventricle view. Highly mobile thrombus in the right atrium. B. Apical four-chamber view. Severe swirling in the RA. No masses seen in the cardiac chambers. Severe LV and RV dysfunction.

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