Toddler with a newly placed central venous catheter that can be infused through but cannot be drawn back from

Radiograph of central venous cathetertip flush against the wall of the superior vena cava
CXR AP (above) shows the tip of the central venous catheter to be flush against the wall of the superior vena cava. Image taken during contrast injection of the central venous catheter (below) show the tip of the catheter has moved away from the wall of the superior vena cava during injection.

The diagnosis was pediatric central venous catheter malfunction because the tip of the catheter is flush against the wall of the superior vena cava.