accessory hemiazygos vein
noun
: a vein that drains the upper left side of the thoracic wall, descends along the left side of the spinal column, and empties into the azygos or hemiazygos veins near the middle of the thorax
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“Accessory hemiazygos vein.” Merriam-Webster.com Medical Dictionary, Merriam-Webster, https://www.merriam-webster.com/medical/accessory%20hemiazygos%20vein. Accessed 26 Nov. 2025.
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