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| Endocardial Cushion Defects Persistent Common Atrioventricular Canal | Persistent Ostium Primum | Cushion Defect, Endocardial | Cushion Defects, Endocardial | Defect, Endocardial Cushion | Defects, Endocardial Cushion | Endocardial Cushion Defect A spectrum of septal defects associated with persistence of the embryonic atrioventricular canal due to incomplete growth and fusion of the endocardial cushion. |