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Fig. 4A —33-year-old woman who had undergone intracranial aneurysm clipping received inferior vena cava (IVC) filter for recent pulmonary embolism. Venogram after filter retrieval, which required increased force, shows sharply delineated IVC wall abnormality with small amount of contrast material (arrow) outside IVC lumen. Arrowhead indicates indentation of right common iliac artery.