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Figure 1: The cartoon shows the two different variants of so-called "double outlet right atrium". The left hand panel shows the situation when there is absence of the left atrioventricular connection (white star with red borders). In this setting, the double outlet exists because the right atrioventricular valve straddles the crest of the muscular ventricular septum, with a ventricular septal defect between its ventricular surface and the septal crest (white arrow with red borders). The right hand panel shows the arrangement with common atrioventricular junction and atrioventricular septal defect (paired white arrows with red borders). This variant is due to malalignment of the primary atrial septum, with the left atrium exiting through an ostium primum defect (upper white arrow in right hand panel)

Figure 1: The cartoon shows the two different variants of so-called