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Azygos vein

Vladimir Lemaire

Article Published: Sep 25, 2018    Article Revised: Mar 2, 2023

The following 2D and color Doppler images demonstrate the normal course of the azygos vein, originating in the retroperitoneal space of the abdomen, to the right of the spine, passing through the posterior diaphragm, running right and posterior to the heart in the thorax, to reach the superior vena cava at the site of its junction with the right atrium.

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Image 1: Visualization of the azygos vein at the level of the upper abdominal plane.
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Image 2: Visualization of the azygos vein at the level of the 4-chamber view.
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Image 3: Visualization of the azygos vein at the level of the 3-vessel and tracheal views (grayscale).
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Image 4: Visualization of the azygos vein at the level of the 3-vessel and tracheal views (color Doppler).
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Image 5: Parasagittal view showing the azygos vein connecting to the superior vena cava (SVC), at the level of the azygos arch, in the second trimester, using color Doppler with Radiant flow.
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Image 6: Parasagittal view showing the azygos vein connecting to the superior vena cava (SVC), at the level of the azygos arch, in the third trimester, using high-definition (HD) color Doppler with Radiant flow

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