Preschooler with a catheter that is difficult to infuse

Line study of a fibrin sheath on a central venous catheter
CXR obtained 6 months before (above left) compared to the scout image obtained before the line study (above right) shows the tip of the catheter has migrated proximally the height of one vertebral body between the two exams. Image from the line study (below) shows contrast outlining a sheath where the catheter tip used to be.

The diagnosis was fibrin sheath where the tip of the catheter was previously.