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Fig. 9 | Insights into Imaging

Fig. 9

From: The inferior vena cava: anatomical variants and acquired pathologies

Fig. 9

Distended collateral vein mistaken for mass in context of incidentally detected suprarenal IVC stenosis. The 54-year-old man had no previous history of IVC filter insertion or intrabdominal surgery. a Contrast-enhanced sagittal CT shows a pseudomass (arrow) immediately posteroinferior to complete stenosis (arrowhead) of the suprarenal IVC, with caudal segments of the IVC (asterisk) preserved. A small focus of calcification is present at the level of the stenosis. b Axial CT shows preferential blood flow through markedly distended azygos and hemiazygos veins (arrows). c Axial MR T1 VIBE image shows a well-defined lobulated mass (arrow) with venous enhancement. d Axial MR T2 image of the mass (asterisk) shows high T2 signal in keeping with slow venous flow. It communicates posteriorly with the right ascending lumbar vein (yellow arrowhead) and medially with a right paravertebral collateral vein (white arrowhead)

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