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Cross-sectional view of the atrial septum showing the tunnel of the PFO (red arrow) passing between the infoding (triangle) of the right atrial wall (septum secundum) and the flap valve of the fossa (septum primum) in the antero-superior part of fossa ovalis. MV = mitral valve; TV = tricuspid valve; Sup caval vein = superior caval vein. (Reproduced with permission from Oxford University Press).
