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Illustration of feasible (A), borderline (B) and unfeasible (C) defect for device closure in posterior rim deficiency. For the defects with posterior rim deficiency, the extent of rim deficiency determines feasibility of device closure, so the clear anatomic definition is very important. SVC, superior vena cava; IVC, inferior vena cava; AAo, ascending aorta; TV, tricuspid valve.
