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Virtual dissection of an atrioventricular septal defect in four-chamber (Panel A) and right anterior oblique (Panel B) planes. In the right anterior oblique plane (Panel B) the superior and inferior bridging leaflets are seen to have chordal attachments to the crest of the muscular interventricular septum, with small ventricular level shunting between the chordae. There is a large atrial component to the defect. There is additionally a small oval fossa defect.
