Ultrasonographically guided percutaneous thrombin injection is the treatment of choice for iatrogenic femoral pseudoaneurysms, which mostly result from catheterization procedures. This is the first time, to our knowledge, thatacute and subacute coronary stent thrombosis after percutaneous thrombin injection has been reported. This method should be reserved forselected patients, and special consideration should be given to patients with a history of recent acute coronary syndrome and stent implantation.