[Giant Right Coronary Artery Pseudoaneurysm:Report of a Case].

Giant coronary artery aneurysm is very rare and there is no clear consensus regarding its treatment. Herein, we report a case of this unusual entity. The patient was a 75-year-old man in whom follow-up coronary angiography showed leakage of contrast agent from one of the #4 posterior descending( #4PD) branch of the right coronary artery. Enhanced computed tomography (eCT) revealed a giant pseudoaneurysm with a maximum diameter of 55 mm. Percutaneous balloon angioplasty had been performed in the same vessel for angina pectoris 20 years earlier. We excluded the pseudoaneurysm from arterial perfusion by closing both the wall defect and the culprit branch under cardiopulmonary bypass. There was no need for revascularization because there was another #4PD branch nearby. No adverse events were observed after surgery. Postoperative eCT scans confirmed that the aneurysm was completely thrombosed with no leakage.