Case report
The azygos vein is formed in the retroperitoneal abdominal space by the joining of several small veins, including lumbar and right intercostal veins.
The normal azygos vein courses along the right side of the spine, passes through the posterior diaphragm, right and posterior to the heart in the chest, and drains into the SVC at the level of its connection with the right atrium
Following Doppler color and 3D images show the normal anatomy of the azygous arch draining into SVC and the relation with the adjacent anatomical structures.