Persistent left superior vena cava

Persistent left superior vena cava
The (right) superior vena cava (on left) and the left brachiocephalic vein (here labeled as left innominate vein). The left superior vena cava is not shown in this image.

In anatomy, a persistent left superior vena cava is the most common variation of the thoracic venous system. It is present in between 0.3% and 0.5% of the population, and is an embryologic remnant that results from a failure to involute.

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