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Fig. 4B —11-year-old boy with coarctation of aorta, bicuspid aortic valve, double superior vena cava, and agenesis of left brachiocephalic vein. Axial T1-weighted (A) and collapsed gadolinium-enhanced (B) MR angiograms show presence of double superior vena cava (arrows) and agenesis of left brachiocephalic vein, which is formed by preservation of left common cardinal vein with obliteration of whole precardinal anastomosis.