Cardiac Radiography > Great Vessels > Azygous Vein

Azygous Vein

The arch of the azygous vein can be found directly above the right upper lobe bronchus. In an upright patient, its transverse diameter is usually not greater than 7 mm. Enlargement of the azygous vein (see figure below) can be seen with increased right atrial pressure or vena cava obstruction.


Enlargement of the azygous vein (arrow) in a patient with right ventricular failure secondary to left ventricular failure. 


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