Pericardiacophrenic veins are the

vena comitans Vena comitans is Latin for accompanying vein. It refers to a vein that is usually paired, with both veins lying on the sides of an artery. They are found in close proximity to arteries so that the pulsations of the artery aid venous return. B ...

of the pericardiacophrenic arteries. Pericardiacophrenic vessels accompany the phrenic nerve in the middle mediastinum of the thorax. The vein drains into the

internal thoracic vein In human anatomy, the internal thoracic vein (previously known as the internal mammary vein) is a vessel that drains the chest wall and breasts. Structure Bilaterally, the internal thoracic vein arises from the superior epigastric vein, an ...

, or

brachiocephalic vein The left and right brachiocephalic veins (previously called innominate veins) are major veins in the upper chest, formed by the union of each corresponding internal jugular vein and subclavian vein. This is at the level of the sternoclavicular j ...

References

Veins of the torso {{circulatory-stub