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A third form of ASD is the sinus venosus defect, a hole usually at of the upper or lower part of the atrial septum due to failure of the embryonic superior vena cava (SVC) or the inferior vena cava (IVC) to merge with the atria properly.
A third form of ASD is the sinus venosus defect, a hole usually at of the upper or lower part of the atrial septum due to failure of the embryonic superior vena cava (SVC) or the inferior vena cava (IVC) to merge with the atria properly.