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Fig. 5. —45-year-old-man with native complex coarctation of aorta (arrow) involving origin of left subclavian artery. Left common carotid artery is missing. Maximal-intensity-projection reformation of MR angiography shows dilated left subclavian (asterisk) and innominate (dot) arteries. Note that only right internal mammary artery (arrowheads) is dilated because of increased collateral flow. Left internal mammary artery is of normal size because it originates from left subclavian artery, which branches distal to aortic narrowing and thus does not serve as collateral vessel. Left subclavian dilatation is presumably secondary to poststenotic turbulence.