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The posterior border of the azygos vein is indented at each vertebral level by the posterior intercostal arteries which can be traced to the descending aorta by a clockwise rotation. Alternatively when an anticlockwise sweep is made from the aorta to the azygos vein the posterior intercostal arteries can be traced going from behind the AV to merge into the lateral part of the descending aorta AV = Azygos vein
