Conclusions-The key anatomical crite- rion for the diagnosis of sinus venosus defects is overriding of the mouth of the superior or inferior caval vein across the intact muscular border of the oval fossa. The interatrial communication is then Formed within the mouth of the overrid- Ing vein, and is outside the confines of the Oval fossa. Background-The diagnosis of sinus Venosus defects remains a matter of Debate. It is crucial to provide solid Anatomical criteria, by identifying the Very nature of the atrial septum relative To sinus venosus defects, to diagnose and Differentiate them from other interatrial Communications.
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