A large vein on the right side at the back of the thorax, draining into the superior vena cava.‘A persistent left superior vena cava may be associated with the presence of two azygos veins.’
- ‘Other unusual sites of drainage include the coronary sinus, inferior vena cava, azygos vein, left subclavian vein, portal vein, and left persistent superior vena cava.’
- ‘The thoracic duct has also been found draining into the azygos vein and the inferior vena cava.’
- ‘When this occurs the posterior intercostal veins on the left side of the thorax may drain into the azygos vein independently.’
- ‘The thoracic duct is located slightly ventral and medial to the azygos vein.’
Mid 17th century azygos from Greek azugos, from a- ‘without’ + zugon ‘yoke’, the vein not being one of a pair.
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