azygos vein


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Related to azygos vein: thoracic duct, hemiazygos vein

azygos

 [az´ĭ-gos]
any unpaired part, as the azygos vein.
azygos vein a vein beginning in the abdomen as a continuation of the ascending lumbar vein; it and its tributaries serve as vessels for the return of blood from the thorax to the superior vena cava. The azygos vein also serves as a connecting link, through the ascending lumbar vein, between the venae cavae returning blood from above and below the heart. See anatomic Table of Veins in the Appendices.

az·y·gos vein

[TA]
vein arising from the merger of the right ascending lumbar vein with the right subcostal vein and often a communication with the inferior vena cava; ascends through the aortic hiatus of the diaphragm or its right crus; it runs along the right side of the thoracic vertebral bodies in the posterior mediastinum, and terminates by arching anteriorly over the root of the right lung to enter the posterior aspect of the superior vena cava.
Synonym(s): vena azygos [TA], azygos (2) , vena azygos major

az·y·gos vein

(az'i-gŏs vān) [TA]
Arises from the merger of the right ascending lumbar vein with the right subcostal vein and often a communication with the inferior vena cava; ascends through the aortic hiatus of the diaphragm or its right crus; it runs along the right side of the thoracic vertebral bodies in the posterior mediastinum, and terminates by arching anteriorly over the root of the right lung to enter the posterior aspect of the superior vena cava.
Synonym(s): azygos (2) .
References in periodicals archive ?
Caudally, they join the corresponding subcardinal vein close to the inter-cardinal anastomosis thus the azygos vein originates as the ascending lumbar vein on both sides.
Inadvertent port: Catheter placement in azygos vein. Int J Angiol 2012;21:103-6.
Caption: Figure 1: Enhanced axial chest CT image (a) and oblique axial thin-slab maximum-intensity-projection (MIP) images (b, c) inferior to (a) show thrombosed and stenosed SVC (arrowhead) and distended and occluded azygos vein (black block arrow).
The lymphadenpathy was more subtle than the sarcoid case above, but can be confidently called because of the adjacent azygos vein and aortic enhancement.
The right IVC, once receiving the left and right renal veins, ran upwards as a single vein continuing superiorly as the azygos vein within the retrocrural space.
For tracheo-oesophageal fistula with atresia in 202 patients (90.5%) was in the form of right anterio-lateral thoracotomy through 4th intercostal space, extrapleural approach, division of azygos vein, ligation and division of tracheo-oesophageal fistula (Fistula closed by three interrupted proline sutures), adequate mobilization of proximal blind pouch and primary oesophageal anastomosis.
It contains the heart enclosed in the pericardium, the ascending aorta, the lower half of the superior vena cava with the azygos vein opening into it, the bifurcation of the trachea and the two bronchi, the pulmonary artery dividing into its two branches, the right and left pulmonary veins, the phrenic nerves, and some bronchial lymph glands.