Atrioventricular septal defect with a Rastelli type A common atrioventricular valve. (A) Internal view of right heart chambers. Note the small ostium primum (upper asterisk) continuous with atrioventricular septal defect (lower asterisk) and interchordal spaces (arrow). (B) The 4-chamber echocardiographic image shows the same characteristics seen in the anatomic specimen. Abbreviations as before.