Toddler with a central venous catheter that is difficult to infuse through and difficult to draw back from

Central catheter injection of thrombus at the tip of a central venous catheter
Scout image from a fluoro exam (left) shows the catheter is radiographically intact with its tip in the brachiocephalic vein. Images obtained during contrast injection (center and right) show contrast filling and outlining an irregularly shaped object at the tip of the catheter.

The diagnosis was central venous catheter malfunction due to a large thrombus at the tip of the catheter.