accessory hemiazygos vein

Medical Dictionary

accessory hemiazygos vein n.
A vein that is formed by the union of the fourth to seventh left posterior intercostal veins, passes along the fifth, sixth, and seventh thoracic vertebrae, crosses the midline behind the aorta, esophagus, and thoracic duct, and empties into the azygos vein.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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WordNet
accessory hemiazygos vein

noun
a vein formed by the union of the 4th to 7th posterior intercostal veins; empties into the azygos vein 
WordNet® 3.0, © 2006 by Princeton University.
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