Image A is an unlabeled axial CT without IV contrast, soft tissue windows. Image B shows labels:

yellow-trachea

orange-esophagus

green-catheter

blue-left brachiocephalic vein

red-hematoma

This catheter started out in the subclavian vein on the left, but then exited the vein and passed through the mediastinum to end with its tip posterior to the esophagus, producing a lot of bleeding in the region. It was removed and the patient recovered.