IVUS of the azygous vein IVUS from distal ascending portion (A) to junction of the arch with the superior vena cava (F)
Legend: 1. intercostal artery (asterisk) indenting the azygous vein, 2. Intercostal vein; 3. Typical compression of mid-portion of the ascending azygous vein; 4. Spine; 5. Aorta; 6.orifice of accessory hemiazygous vein.
Figure 3A: Partial valvular stenosis with associated webs: 1. shows 60% stenosis of the IJV at the confluens with the subclavian vein. Contast contour is smooth. 2. The IVUS probe at site of interrogation. 3. There is evidence of echogenic thickening at the edges of this immobile valve (white arrows). This represents the stenosis. The outer wall of the vein (black arrows) is much larger than the area that contains the contrast media
Figure 3B: Total valvular obstruction: 1. Axial and longitudinal views show a widely patent upper internal jugular vein. There is strong lumen/intimal interface. 2. More inferiorly as the transducer traverses the obstruction, a lumen is not visible on either longitudinal or axial views.
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