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Repair of a Mycotic Coronary Artery Aneurysm with an Intact Prosthetic Aortic Valve. We describe the case of a 75-year-old man with a mycotic right coronary artery aneurysm without evidence of prosthetic valve endocarditis. Eight years previously he had undergone coronary artery bypass surgery and aortic valve replacement. He presented with methicillin resistant staphylococcus aureus septicaemia after a prolonged hospital admission. Further investigation revealed a large mycotic right coronary artery aneurysm prompting urgent surgical repair. This case, of a mycotic coronary artery aneurysm in an atherosclerotic native coronary artery, is an extremely rare entity, which is further complicated by the presence of a prosthetic aortic valve.