PMC8086665_01
A. Superior vena cava (SVC) selective angiography (left) showing shunt between right and left atria through the sinus venosus atrial septal defect (SVASD) and left anterior oblique fluoroscopy (right) showing four leads temporarily present in four chambers of the heart; B. Chest computed tomography scan: sagittal plane (left) showing SVASD (dashed line) at the upper most part of inter atrial septum (asterisk) with SVC overriding the defect and three-dimensional reconstruction (right) showing the position of the superior SVASD (dotted black line) and abnormal drainage of the right upper pulmonary vein (RUPV) to the SVC. Left atrium (LA) in red, right atrium (RA) in blue, SVC in green and RUPVs in yellow; LV : left ventricle; RV : right ventricle.
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Video 1, Fig. 1A, left). At left anterior oblique fluoroscopy four leads were temporarily present in four chambers of the heart (Fig. 1A, right) showing left sided leads posteriorly located. Contrast chest computed tomography scan at sagittal plane (Fig. 1B, left) and three-dimensional reconstruction (Fig. 1B, right) showed concealed superior sinus venosus atrial septal defect with partial anomalous pulmonary venous return.