It is important to be aware of the [[Aberrant right subclavian artery]] (ARSA) before surgical approaches to upper thoracic vertebrae in order to avoid complications and effect proper treatment. In patients with a known ARSA, a right transradial approach for aortography or [[cerebral angiography]] should be changed to a left radial artery or trans[[femoral artery approach]]
((Choi Y, Chung SB, Kim MS. Prevalence and Anatomy of Aberrant Right Subclavian 
Artery Evaluated by Computed Tomographic Angiography at a Single Institution in
Korea. J Korean Neurosurg Soc. 2019 Mar;62(2):175-182. doi:
10.3340/jkns.2018.0048. Epub 2019 Feb 27. PubMed PMID: 30840972; PubMed Central
PMCID: PMC6411572.
)).