Left sided superior vena cava
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A left sided superior vena cava is seen coursing anterior to the left hilum and inferior to the aortic arch, following which it courses medially, anterior to the trachea and joins the normal right sided superior vena cava.
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A left sided SVC is the most common vascular anatomic variant seen in the chest, and is usually asymptomatic and therefore an incidental finding. A small proportion of left sided SVC's that drain directly into the left atrium can cause left to right shunt, which may be symptomatic.