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8. Venogram — superior vena cava, AP projection

This study was performed by injecting contrast into veins in both arms simultaneously.

Note that the left brachiocephalic vein has a longer, more oblique course than the right one, since the left vein must cross the width of the mediastinum to enter the superior vena cava. The right brachiocephalic vein's course is shorter and more vertical.

Note also that the L. pulmonary artery is more superior than the R. pulmonary artery at the point where each enters into respective hilum, since the L. pulmonary artery crosses over the L. main bronchus in the mediastinum (See Images #3 and #5).