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Figure 4 (A and B) A selective angiogram illustrating multiple stenoses, (arrowheads) in the modified Blalock-Taussig shunt in a patient who underwent unifocalization of the pulmonary arteries. There were stenoses in distal pulmonary arteries. (C and D) After angioplasty, the stenoses in the shunt were relieved with increased pulmonary blood flow. There was occlusion of a left distal pulmonary artery (arrow).