Medical Definition of Hemiazygos vein
1.
Formed by the merger of the left ascending lumbar vein with the left subcostal vein or a communication from the inferior vena cava, it pierces the left crus of the diaphragm, ascends along the left side of the bodies of the lower thoracic vertebrae, opposite the eighth vertebra, crosses the midline behind the aorta, thoracic duct, and oesophagus, and empties into the azygos vein, sometimes in common with the accessory hemiazygos vein.
Synonym: vena hemiazygos, vena azygos minor inferior.
(05 Mar 2000)
Lexicographical Neighbors of Hemiazygos Vein
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