This can look scary the first time you see it. The limbs of the inferior vena cava filter were outside the lumen of the inferior vena cava. After discounting motion artifact, the only possibility left was that the limbs had actually dug their way out of the inferior vena cava. It's a not uncommon occurrence with inferior vena cava filters, and as long as the filters don't penetrate adjacent structures (bowel, aorta, pancreas, vertebral bodies), it's usually not of concern.
References
- Al-Basheer MA, et al. Chronic pain syndrome caused by a Bird's Nest filter: first case report. Cardiovasc Intervent Radiol. 2008 Jul;31 Suppl 2:S182-4.
- DuraiRaj R, Fogarty S. A penetrating inferior vena caval filter. Eur J Vasc Endovasc Surg. 2006 Dec;32(6):737-9.
- Putterman D, Niman D, Cohen G. Aortic pseudoaneurysm after penetration by a Simon nitinol inferior vena cava filter. J Vasc Interv Radiol. 2005 Apr;16(4):535-8.
- Sadaf A, et al. Significant caval penetration by the celect inferior vena cava filter: attributable to filter design? J Vasc Interv Radiol. 2007 Nov;18(11):1447-50.
This can look scary the first time you see it. The limbs of the inferior vena cava filter were outside the lumen of the inferior vena cava. After discounting motion artifact, the only possibility left was that the limbs had actually dug their way out of the inferior vena cava. It's a not uncommon occurrence with inferior vena cava filters, and as long as the filters don't penetrate adjacent structures (bowel, aorta, pancreas, vertebral bodies), it's usually not of concern.
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