ac·ces·so·ry hem·i·az·y·gos vein

[TA]

vein formed by the union of the fourth to seventh left posterior intercostal veins, it passes along the side of the bodies of the fifth, sixth, and seventh thoracic vertebrae, then crosses the midline posterior to the aorta, esophagus, and thoracic duct, and empties into the azygos vein, sometimes in common with the hemiazygos vein.

Synonym(s): vena hemiazygos accessoria [TA], vena azygos minor superior

Farlex Partner Medical Dictionary © Farlex 2012

ac·ces·so·ry hem·i·az·y·gos vein

(ak-ses'ŏr-ē hem'ē-ā-zī'gos vān) [TA]

Formed by the union of the fourth to seventh left posterior intercostal veins, passes along the side of the bodies of the fifth, sixth, and seventh thoracic vertebrae, then crosses the midline behind the aorta, esophagus, and thoracic duct, and empties into the azygos vein, sometimes in common with the hemiazygos vein.
Synonym(s): vena hemiazygos accessoria [TA] .

Medical Dictionary for the Health Professions and Nursing © Farlex 2012

Mentioned in

References in periodicals archive

(1) Cannulation of the accessory hemiazygos vein is rare but can happen when the accessory hemiazygos vein drains into the left brachiocephalic vein instead of the azygos vein normally.

Malposition of a hemodialysis catheter in the accessory hemiazygos vein

LBV= Left brachiocephalic vein; SVC= Superior vena cava; Ao= Aorta; Az= Azygos vein; AHA= Accessory hemiazygos vein; HAz= Hemiazygos vein and IAz= Interazygos vein.

Pre-aortic Inter-azygos Veins: Two Case Reports/ Venas Interacigos Pre-aorticas: Reporte de Dos Casos

Communications of the hemoazygos, accessory hemiazygos veins into the azygos vein are identified and exposed by reflecting the oesophagus and aorta upwards.

Study of azygos system and its variations

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