A 61-year-old man underwent percutaneous coronary intervention (PCI) for the right coronary artery. However, he had an acute onset of right neck pain and swelling after PCI. Contrast enhanced computed tomography (CT) revealed extravasation into the mediastinum and aberrant right subclavian artery. After transfer to our hospital, we performed emergency endovascular repair for iatrogenic arterial injury. His postoperative course was uneventful.