A. Thrombus fills the lumen and surrounds the transducer (curved arrow) which nearly fills the lumen. The thrombus is displayed as bright mottled echogenic reflections. The venous wall is well seen (straight arrow); in this case it is located within the dural sinus characterized by a triangular shape. B.The brightly echogenic thrombus extends into the internal jugular vein.
Figure 8: Phasic narrowing of azygous vein
Venography (not shown) revealed a long tapered narrowing of the ascending part of the azygous vein. IVUS, performed in both expiration and inspiration, clearly shows the phasic nature of this stenosis. No benefit will be derived from venoplasty because IVUS has demonstrated that this is not a fixed stenosis.
