Fig. 1

a Preliminary angiogram demonstrating the access site of the central venous catheter with the entry point located in between the vertebral artery and the thyrocervical trunk. An 8-mm diameter occlusion balloon catheter is placed in the subclavian artery near the entry point of the misplaced central venous catheter. b Angiogram executed after the deployment of the PP and during the tightening of the knot. On the upper side, the slipknot is located close to the arterial wall (arrow). c Final angiogram confirming the absence of active bleeding, stenosis or pseudoaneurysm