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Figure 8: The anatomic section (left hand panel), and the three-dimensional echocardiograms from a different patient (right hand and middle panels), show that the defining feature of a perimembranous ventricular septal defect is the fibrous continuity in the posteroinferior quadrant of the hole between the leaflets of the aortic and tricuspid valves. Note that the atrioventricular component of the membranous septum (star) is an integral part of the area of fibrous continuity

Figure 8: The anatomic section (left hand panel), and the three-dimensional echocardiograms from a different patient (right hand and middle panels), show that the defining feature of a perimembranous ventricular septal defect is the fibrous continuity in the posteroinferior quadrant of the hole between the leaflets of the aortic and tricuspid valves. Note that the atrioventricular component of the membranous septum (star) is an integral part of the area of fibrous continuity