hemiazygos vein

(redirected from Hemiazygos)

hem·i·az·y·gos vein

[TA]
formed by the merger of the left ascending lumbar vein with the left subcostal vein or a communication from the inferior vena cava, it pierces the left crus of the diaphragm, ascends along the left side of the bodies of the lower thoracic vertebrae, opposite the eighth vertebra, crosses the midline posterior to the aorta, thoracic duct, and esophagus, and empties into the azygos vein, sometimes in common with the accessory hemiazygos vein.

hem·i·a·zy·gos vein

(hem'ē-ā-zī'gŏs vān) [TA]
Formed by the merger of the left ascending lumbar vein with the left subcostal vein or a communication from the inferior vena cava, it pierces the left crus of the diaphragm, ascends along the left side of the bodies of the lower thoracic vertebrae, opposite the eighth vertebra, crosses the midline behind the aorta, thoracic duct, and esophagus, and empties into the azygos vein, sometimes in common with the accessory hemiazygos vein.

hemiazygos vein

A vein running along the back wall of the lower thorax on the left side of the thoracic aorta. At the level of the eighth thoracic vertebra, the hemiazygos vein bends to the right, runs behind the aorta, and empties into the azygos vein. Tributaries to the hemiazygos vein include the left bronchial, left lower intercostal, left subcostal, and left ascending lumbar veins; often, there is a caudal anastomosis with the left renal vein. The patterns and interconnections of the azygos, hemiazygos, and accessory azygos veins are variable.
See also: vein
References in periodicals archive ?
The splenic vein and superior mesenteric vein joined and drained directly into the hemiazygos vein without passing through the liver [Figure 1]c and [Figure 1]d.
A rare presentation of double inferior vena cava with anomalous pattern of azygos and hemiazygos venous systems: A case report; J Anat Soc India 51(1]:6567, (2002],
Sometimes left-sided PAPVR drains via a persistent left SVC into the coronary sinus, a pericardiophrenic vein or the hemiazygos vein [1,7].
In addition, a left inferior vena cava (IVC) with hemiazygos continuation was also found.
The supercardinal system forms the azygos and hemiazygos veins.
The contents of this space may be subjected to the various pathologic processes, including lipoma, lymphangioma, vascular abnormalities like aortic aneurysm, hematoma, azygos and hemiazygos continuation of the inferior vena cava, and abscesses.
Fluoroscopy showed the catheter coursing from left internal jugular vein into the accessory hemiazygos vein (arrow in Figure 1 Panel B).
Congenital interruption of the inferior vena cava with hemiazygos continuation.
In the thoracic region, the supracardinal veins give rise to the azygos and hemiazygos veins.
The portion of the right supracardinal vein cephalad to the kidneys becomes the azygos vein; similarly, that portion on the left forms the hemiazygos system.