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.
16-MDCT depiction of accessory hemiazygos vein draining into the left brachiocephalic vein.(Cardiac Radiology)(Clinical report)
Jan 01, 2007; Byline: Ram. Galwa, Mahesh. Prakash, N. Khandelwal Introduction The venous system may show many variations due to its complex...