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 ?
Before replacing a new permanent catheter, a venography for upper extremities and superior vena cava was performed by interventional radiology and no flow of contrast agent was observed in superior vena cava vein, suggesting an obstruction in vena cava superior vein and right and left juguler vein's blood flows were through azygos and hemiazygos veins respectively.
The tributaries are right superior intercostal veins, 4th to 11th right posterior intercostal veins, hemiazygos vein, accessory hemiazygos vein, right bronchial vein, several oesophageal, mediastinal and pericardial veins.
More rarely cases of LSIVC, possible routes for the return of blood to RA are via the azygos vein to SVC, via the left brachiocephalic vein to the right SVC, or via the hemiazygos vein to PLSVC(3).
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.
On the left side the abdominal aorta and the hemiazygos vein were close to the nerves, while on the right were inferior vena cava and the azygos vein.
Most of the cases inferior vena cava interruption occurs, so we need to prepare for hemiazygos route.
Fitoz, "Right nutcracker syndrome associated with left-sided inferior vena cava, hemiazygos continuation and persistant left superior vena cava: a rare combination," Clinical Imaging, vol.
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.
Congenital interruption of the inferior vena cava with hemiazygos continuation.
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.