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Vena caval foramen

Last reviewed dd mmm yyyy. Last edited dd mmm yyyy

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The vena caval foramen is the diaphragmatic aperture through which the vena cava passes. It has the following characteristics:

  • in expiration, situated at the level of the lower border of T8 vertebra which approximates the 6th costal cartilage
  • the most superior of all the large diaphragmatic apertures
  • passes through the tendinous part of the diaphragm a few centrimetres anterior to the vertebral body and to the right of the median plane
  • the vena cava is firmly attached to the sides of the foramen; consequently, on contraction of the diaphragm, the aperture descends and increases in diameter. This has the effect of increasing vena caval diameter and facilitating thoracic venous return.
  • other structures that may pass through the aperture include:
    • right phrenic nerve
    • ascending lymphatics
    • infrequently, the right hepatic vein

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