Coronary artery aneurysms are an uncommon disease whose incidence ranges from 0.3% to 5.3%. The right coronary artery is affected in 40-70% of cases. Percutaneous coronary angioplasty is among causative factors, in particular with stent implantation. We present a case of large post-angioplasty aneurysm of the right coronary artery requiring surgical correction.