Figure Legends
Figure 1. Electrocardiogram showing sinus rhythm with no significant anomalies.
Figure 2. A. TEE showing severe dilation of the LA (LAVI 58.7 mL/m2) with a 59 x 49 mm mass (*) adhered to the interauricular septum. B. TEE at 139° showing the prolapse of the mass (*) towards the left ventricle during diastole.C. TEE at 0° showing protrusion of the mass (*)towards the LV during diastole. D. TEE at 0° showing a pedunculated mass (*) adhered to the interauricular septum in the LA, measuring 59 x 49 mm. Abbreviations: LA: left atrium; LV: left ventricle; AV: aortic valve; Ao: aorta; RA: right atrium; RV: right ventricle.
Figure 3. A. Macroscopic architecture of the resected left atrial myxoma. B. Mucoid degeneration with stellate cells (pseudo-neuronal tissue) (*) and septations (black colored arrow) lined by endothelial cells (red colored arrow) . A slight resin artifact is observed in the right side of the image.C. Mucoid degeneration (*) in the midst of fibrous tissue (+) forming pseudovascular canals (black colored arrow) . D. Slide showing the division between myxomal tissue(*) and myocardial tissue (+) .
Figure 4. A. TTE showing a pedunculated mass (white arrow) in the LA measuring approximately 60 x 50 mm. B. 3D reconstruction of the pedunculated mass (white arrow) .C. Transillumination echocardiography during systole showing a septated, regular, pedunculated mass (*) in the LA with its attachment (white arrow) to the interatrial septum. D.Macroscopic anatomy of the resected mass showing similar morphology to the one observed through transillumination echocardiography. Abbreviations: LA: left atrium; LV: left ventricle; AV: aortic valve; Ao: aorta.