PMC9197382_01
2-dimensional (A) and 3-dimensional (B) image of the isoechoic mass using transesophageal echocardiography. (A) 16x10x10 mm isoechoic mass. This image shows an isoechoic mass on the right interatrial septum near the inferior vena cava. (B) Mass is well-defined, has a smooth surface, and broadly adherent to the atrial.
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F1
The mass had a clear border, smooth surface, and broad base without mobility and apparent feeding vessels (Figure 1; Supplementary Videos 1, 2).
Thoracic computed tomography (CT) and MRI (T1 and T2-weighted) images. (A) CT shows a high-intensity nodule on the interatrial septum. (B) Cardiac MRI (T1-weighted image) reveals a nodule that is little higher signal than its surrounding muscle. (C) Cardiac MRI (T2-weighted image) reveals a high-intensity nodule on the interatrial septum, suggesting a cystic lesion with fluid components. RA, right atrium; RV, right ventricle; LA, left atrium; LV, left ventricle; SVC, superior vena cava; IVC, inferior vena cava.
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F2
A plain thoracic computed tomography (CT) revealed a high-intensity nodule on the right interatrial septum at the border of the inferior vena cava (Figure 2A). Based on these findings, the nodule was suggested to be a cystic mass including liquid component (Figures 2B,C).
Macroscopic findings during surgery. (A) The outer surface of the mass is white, smooth, and soft. (B) A yellowish-white viscous mucous material is found in the mass. There are no thrombi inside or outside the cyst. RA, right atrium; RV, right ventricle; LA, left atrium; LV, left ventricle; SVC, superior vena cava; IVC, inferior vena cava.
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F3
A yellowish-white viscous mucous material was found in the mass with no thrombus (Figure 3).
Pathology of the bronchogenic cyst. (A) Hematoxylin and eosin stain; original magnification, 20x. (B) The ciliated columnar epithelium suggests a bronchogenic cyst; original magnification, 400x.
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F4
Pathohistological evaluation revealed multilineage ciliated columnar epithelium and mucous glands present, resembling the respiratory epithelium in the intima of some cyst walls (Figure 4).