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Splaying of titanium Greenfield inferior vena caval filter.

A 65-year-old woman with scleroderma had deep venous thrombosis (DVT) in the left lower extremity. Anticoagulation was contraindicated because of a recent stroke. Inferior vena cavography was performed via the right femoral vein and showed the proximal inferior vena cava (IVC) to be narrowed and irregular (Fig. 1 A); a large lower lumbar collateral was seen. The abnormality was thought to be most likely a sequela of old caval thrombosis. A titanium Greenfield filter (Medi-tech, Watertown, MA) was placed in the normal part of the infrarenal portion ofthe IVC. The insertion was relatively easy, despite the distorted IVC. A postinsertion scout radiograph showed a filter