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Fig. 6. —Flow artifact on CT venogram in 64-year-old man suspected of having pulmonary embolism. Axial CT venogram shows apparent filling defect (arrow) in left common femoral vein. Complete compressibility of this vein was seen on sonography (not shown). Flow artifacts are caused by inadequate delay before scanning. These artifacts are commonly seen on CT venograms in patients with significant peripheral artery disease, even with longer delay.