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Fig. 3 —23-year-old man with situs ambiguus, transposition of great
arteries, common atrium and single ventricle, pulmonary atresia and right
patent ductus arteriosus, and functional left Blalock-Taussig shunt, double
superior vena cava, and hypoplastic left brachiocephalic vein. Coronal
reconstruction chest CT scan shows double superior vena cava (open
arrows) and hypoplastic left brachiocephalic vein (solid
arrows), which is formed by regression of lower precardinal anastomosis
with total preservation of left common cardinal vein and superior precardinal
anastomosis.
