Figure Legends
Figure 1a. Transthoracic echocardiography (TTE) showed a huge mass in the left atrium, that was attached to the interatrial septum.
Figure 1b. Transesophageal echocardiography (TTE) revealed a hyperechogenic, well-demarcated mass in the left atrium, that was attached to the interatrial septum.
Figure 1c. TEE showed a mass, adjacent to the left pulmonary veins.
Figure 1d. 3D TEE image of the mass was seen.
Figure 1e. Cardiac MRI revealed a heterogeneous left atrial mass located on the fossa ovalis.
Figure 1f. Coronary angiography showed that the branch of the circumflex artery surrounded the mass in the form of a net.
Figure 2a. Intraoperative image of the mass was noted.
Figure 2b. Resected mass was seen.
Figure 2c. Histological examination revealed a nested architecture of epitelioid cells, the nests are round or oval in shape and invested by an fibrovascular stroma. Tumor cells had centrally and eccentrically located round nuclei and cytoplasm ranging from finely granular to eosiniphilic (hematoxylin and eosin stain) (the magnification of the image was 10x).
Figure 2d. Tumor had clear cell pattern (hematoxylin and eosin stain) (the magnification of the image was 40x).
Figure 2e. At immunohistochemical staining, the nests were positive for chromogranin A (the magnification of the image was 40x).
Figure 2f. The tumor cell nests are surrounded by supporting sustentacular cells that highlighted by S100 immunohistochemical staining (the magnification of the image was 40x). Staining for cytokeratin and TTF1 was negative (not pictured).