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Absent right atrioventricular connection in l-loop with single aortic outlet (pulmonary atresia). (A) A morphological tricuspid valve joins the left atrium with a main ventricular chamber of right morphology (l-loop), from which the aorta takes origin. The pulmonary valve is atretic (single aortic outlet). (B) At the floor of the right atrium there is no orifice. The underlying ventricular chamber is hypoplastic, posterior, right-sided and of left ventricular morphology (l-loop).
