Sinus venosus ASD is typically located near which structure?

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Multiple Choice

Sinus venosus ASD is typically located near which structure?

Sinus venosus ASD occurs in the atrial septum at the boundary where the sinus venosus drains into the right atrium. It is classically located high, near the entry of the superior vena cava (and, less commonly, near the inferior vena cava). This positioning is what sets it apart from defects in the fossa ovalis, which are ostium secundum defects. The proximity to the vena cava openings also explains frequent accompanying anomalous pulmonary venous return, especially right upper pulmonary veins draining into the SVC/right atrium. So, the defect is best described as being near where the vena cavae enter the right atrium.

Sinus venosus ASD occurs in the atrial septum at the boundary where the sinus venosus drains into the right atrium. It is classically located high, near the entry of the superior vena cava (and, less commonly, near the inferior vena cava). This positioning is what sets it apart from defects in the fossa ovalis, which are ostium secundum defects. The proximity to the vena cava openings also explains frequent accompanying anomalous pulmonary venous return, especially right upper pulmonary veins draining into the SVC/right atrium. So, the defect is best described as being near where the vena cavae enter the right atrium.

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