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Fig. 2. Contrast-enhanced MR angiogram (TR/TE, 4.5/1.9) in
14-year-old boy. Coronal volume-rendered image in right anterior oblique
projection shows major aortopulmonary collateral artery (solid straight
arrow) from descending aorta that divides into collateral branches
(arrowhead) directly supplying right lung and connecting to left
pulmonary artery (open arrow). Left upper lobe pulmonary artery is
atretic. Minor collateral artery (curved arrow) from descending aorta
courses to right upper lobe.