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) .

azygos

1. any unpaired part, as the azygos vein.
2. unpaired. Called also azygous.

azygos vein
a vein beginning in the abdomen and coursing in the dorsal mediastinum which returns blood from the thorax to the heart. The right azygos is found in most domestic animals (rarely the pig) while the left azygos is found in pigs and ruminants.
References in periodicals archive ?
g) The right IVC continues cephalad as the azygos vein (arrow) within the retrocrural space.
The whole course of the azygos vein from the level of the subcostal vein to the point of termination into the superior vena cava has been traced and cleaned.
The position of Azygos vein in on right side in 53.
The right subcardinal vein forms azygos vein and the left subcardinal vein forms hemiazygos vein.
variability of the Azygos vein system in human fetuses.
The Left Supracardinal vein then continued through hemiazygos vein and with azygos vein which opened in the superior vena cava.
A dilated azygos vein may present as widening of mediastinum suggesting a mediastinal mass (21) or dissection of aorta (22) on radiographs.
They ascend deep to the psoas major muscle anterior to the medial portions of the lumbar transverse processes to join with the subcostal veins, which drain into the azygos vein on the right and the hemi-azygos vein on the left, respectively.
In the present case because the lumbar azygos vein is absent on the left side, this communicating channel between the left renal vein and the left ascending lumbar vein might be considered as a dilated lumbar azygos vein though following an abnormal looped course before connecting with the left ascending lumbar vein.
CONCLUSION: Whether we consider this as a dilated communicating vein or a dilated left lumbar azygos vein is open for discussion but the identification of this entity is very important because it may mimic normal and pathological structures that are located in close proximity to the left renal hilum and para-vertebral structures.
Nonetheless, during the procedure Dake increased the level of Zahn's sedation until he was essentially unconscious, and then turned the planned 30-minute diagnostic venogram into a five-hour surgery, placing five stents in Zahn's jugular and azygos veins.