Copyright information:Taken from "Percutaneous subclavian artery stent-graft placement following failed ultrasound guided subclavian venous access"BMC Medical Imaging 2006;6():3-3.Published online 5 May 2006PMCID:PMC1526717. The subclavian sheath is opacified with a small amount of contrast within the lumen of this device (white arrow). The image demonstrates the ventral, proximal entry point of the sheath into the subclavian artery (black arrow).