From the Research
No, the azygous vein arch is not at the same level as the aortic arch. The azygous vein arch is located at the level of the T4 or T5 vertebra, where it arches anteriorly over the right main bronchus to join the superior vena cava, as seen in a study examining the anatomy of the azygos vein using computerized tomography imaging 1. In contrast, the aortic arch is positioned slightly lower, typically at the level of the T4-T5 intervertebral disc or the upper border of T5. This anatomical difference is important for radiologists, surgeons, and clinicians interpreting chest imaging or performing procedures in the thoracic cavity. Some key points to consider include:
- The azygous vein is part of the posterior thoracic venous system that drains blood from the thoracic wall and upper lumbar region.
- The aortic arch is the major arterial structure that gives rise to the brachiocephalic trunk, left common carotid, and left subclavian arteries before continuing as the descending thoracic aorta.
- The level of the azygous vein arch can vary, but it is generally found at the level of the fifth thoracic vertebra, as noted in the study by 1.
- Other studies, such as 2, 3, 4, and 5, provide additional information on the radiological features and diagnostic pitfalls of azygos vein aneurysms, but do not specifically address the level of the azygous vein arch in relation to the aortic arch. However, the most recent and highest quality study, 1, provides the most relevant information for determining the level of the azygous vein arch.