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.

Synonym(s): vena hemiazygos [TA], inferior hemiazygos vein, vena azygos minor inferior

Farlex Partner Medical Dictionary © Farlex 2012

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.

Medical Dictionary for the Health Professions and Nursing © Farlex 2012

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References in periodicals archive

Malposition of a dialysis catheter in the accessory hemiazygos vein. Anesth Analg.

Malposition of a hemodialysis catheter in the accessory hemiazygos vein

The diameters of the azygos vein (AV), hemiazygos vein (HV) and accessory hemiazygos vein (AHV) at various levels: all measurements in mm.

Anatomical Variations of the Azygos Venous System: Classification and Clinical Relevance/ Variaciones Anatomicas del Sistema Venoso Acigos: Clasificacion y Relevancia Clinica

Multiple variations in the azygos venous system: a preaortic interazygos vein and the absence of hemiazygos vein. Surg.

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

The left complement of this venous channel which drain the upper abdominal parietals and the lower thoracic wall in named as accessory hemoazygos vein or superior hemiazygos vein. Both of them drain into the azygos vein

Study of azygos system and its variations

The lumbar vein then ascended upwards in the thorax and joined with the left subcostal vein to continue further up as the accessory hemiazygos vein (figure 3).

Case report: presence of a dilated communicating vein between left renal and left ascending, lumber vein

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.

Malposition of hemodialysis catheter into the hepatic veins

In this instance, the blood related to the lower segment of the body reaches the heart through hypoplastic IVC, the azygos and hemiazygos veins which appear dilated, and also through various collaterals developed as a compensation.

Vena cava hypoplasia VTE

In the thoracic region, the supracardinal veins give rise to the azygos and hemiazygos veins. Progressive changes in the abdomen lead to replacement of the postcardinal veins by the subcardinal and supracardinal veins.

Failed percutaneous mitral commisurotomy due to congenital anomaly of inferior vena cava