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Figure 10: (a) The anatomic dissections show the fundamental difference between the inlet defect seen in the setting of the straddling tricuspid valve (left hand panel) and the atrioventricular septal defect with a common atrioventricular junction (middle panel). Although the muscular ventricular septum extends along the full length of the valvular orifice in both lesions, it is the right atrioventricular valve that overrides in the left hand panel, but a common atrioventricular valve in the right hand panel. There can, however, also be malalignment between the atrial septum and the ventricular septum in the setting of a common atrioventricular junction (right hand panel) (b,c) This also, nonetheless, is fundamentally different from the situation seen with the straddling and overriding of the tricuspid valve (left hand panel)

Figure 10: (a) The anatomic dissections show the fundamental difference between the inlet defect seen in the setting of the straddling tricuspid valve (left hand panel) and the atrioventricular septal defect with a common atrioventricular junction (middle panel). Although the muscular ventricular septum extends along the full length of the valvular orifice in both lesions, it is the right atrioventricular valve that overrides in the left hand panel, but a common atrioventricular valve in the right hand panel. There can, however, also be malalignment between the atrial septum and the ventricular septum in the setting of a common atrioventricular junction (right hand panel) (b,c) This also, nonetheless, is fundamentally different from the situation seen with the straddling and overriding of the tricuspid valve (left hand panel)