Medical Definition of subcostal vein
: either of two veins:
a : one that arises on the right side of the anterior abdominal wall, follows a course along the lower margin of the twelfth rib, and joins in the formation of the azygos vein
— called also right subcostal vein
b : one on the left side of the body that usually empties into the hemiazygos vein
— called also left subcostal vein
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