Cardiac Radiography > Great Vessels > Pulmonary Trunk

Pulmonary Trunk

The main pulmonary artery (pulmonary trunk) is normally present just below the aortic arch. Because it is within the pericardium, its shadow is continuous with the left cardiac border. In adults it should be either flat or concave (see figure below). In children and some young adults it will be convex. Enlargement of the pulmonary trunk suggests increased pulmonary blood flow or increased pressure due to pulmonary valvular stenosis.


In the adult, the pulmonary trunk (arrow) is normally concave or straightened. 


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