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Intravenous ultrasound (IVUS) showing left common iliac vein compression. A. IVUS within the left common iliac vein showing no appreciable lumen of the vein due to complete compression by right common iliac artery positioned directly anterior (arrow). Note that the patient was prone, so the top of image is posterior, and bottom is anterior. B. IVUS within the left common iliac vein at an area adjacent to the compression showing a normal vein lumen.
