Fluoroscopic view of the point at which the axillary vein is entered using ultrasound (US) guidance. The point at which the tip of a 21-gauge needle was advanced through the anterior wall of the axillary vein with direct US is marked with an arrow. The location of the 0.018-in wire, which was passed through the needle and advanced to the level of the inferior vena cava, is also marked with an arrow.