Accessory hemiazygos vein
The accessory hemiazygos vein (vena azygos minor superior) is a vein on the left side of the vertebral column that generally drains the fifth through eighth intercostal spaces on the left side of the body.
The accessory hemiazygos vein varies inversely in size with the left superior intercostal vein.
It receives the posterior intercostal veins from the 4th, 5th, 6th, and 7th intercostal spaces between the left superior intercostal vein and highest tributary of the hemiazygos vein; the left bronchial vein sometimes opens into it.
When this vein is small, or altogether absent, the left superior intercostal vein may extend as low as the fifth or sixth intercostal space.
- Template:SUNYAnatomyLabs - "Mediastinum: The Azygos Vein and Posterior Intercostal Veins"