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Fig. 4B. —CT scans obtained 12 days after placement of modified Blalock-Taussig shunt in same girl imaged in Figure. 3A,3B,3C,3D. On CT scan obtained after administration of IV contrast medium, fluid collection (curved arrow) shows no enhancement, whereas perigraft seroma wall (straight arrow) and modified Blalock-Taussig shunt (arrowhead) show definite enhancement.