Teenager with a catheter that infuses but does not draw back Pediatric Imaging Cardiovascular February 7, 2020January 31, 2020 Scout image from a line study (above) shows the tip of the catheter in the superior vena cava. Injection of contrast (below) shows staining of a large irregularly shaped object resembling thrombus at the tip of the catheter. The diagnosis was thrombus of the catheter tip. Related Published February 7, 2020January 31, 2020