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"A case of inadvertent catheterization into azygos vein is described" Wang et al (2020).

Abstract:

For critically ill patients, central venous catheterization may not always be placed in a correct tip position, even when guided by ultrasound. A case of inadvertent catheterization into azygos vein is described.

Reference:

Wang M, Xu L, Feng Y, Gong S. Misplacement of a central venous catheter into azygos vein via the right internal jugular vein [published online ahead of print, 2020 Aug 13]. J Vasc Access. 2020;1129729820950996. doi:10.1177/1129729820950996