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. 2019 Jun 13;10:63. doi: 10.1186/s13244-019-0753-3

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© The Author(s). 2019

Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.

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Fig. 9 — Blockage of the SVC above the azygos vein. a Schematic image of a SVC obstruction above the level of the azygos vein and pathway for collateral flow. b Axial CT image of a 46-year-old male with squamous cell carcinoma (asterisk) causing SVC compression (white arrow) above the azygos vein due to extrinsic mass effect. c Axial CT image showing a dilated azygos vein (gray arrow) entering into the SVC below the blockage. d Axial CT image shows contrast enhancement of the SVC downstream of the blockage (white arrow); the dilated azygos vein is also seen (gray arrow)