Inferior vena cava
Average diameter
20 mm
Ultrasound
X-ray computed tomography
Highly variable diameter fluctuating with breathing and intravascular volume (13-30 mm in this study).
Reference
Prince MR, Novelline RA, Athanasoulis CA et-al. The diameter of the inferior vena cava and its implications for the use of vena caval filters. Radiology. 1983;149 (3): 687-9.
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