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Figure 1: Freedom's classification of PFAA. Top left: Type 1, systemic-to-systemic PFAA. A case of double lumen aortic arch is shown. Top right: Type 2, systemic-to-pulmonary PFAA, in a case associated with pulmonary atresia. Bottom left: Type 3, pulmonary-to-systemic PFAA associated with left-sided obstructive lesions. A case of PFAA associated with aortic atresia and Type B aortic arch interruption. Bottom right: Type 4, Bilateral PFAA, with right double lumen aortic arch and left PFAA. PFAA: Persistence of fifth aortic arch

Figure 1: Freedom's classification of PFAA. Top left: Type 1, systemic-to-systemic PFAA. A case of double lumen aortic arch is shown. Top right: Type 2, systemic-to-pulmonary PFAA, in a case associated with pulmonary atresia. Bottom left: Type 3, pulmonary-to-systemic PFAA associated with left-sided obstructive lesions. A case of PFAA associated with aortic atresia and Type B aortic arch interruption. Bottom right: Type 4, Bilateral PFAA, with right double lumen aortic arch and left PFAA. PFAA: Persistence of fifth aortic arch