Mycotic aneurysm of the ascending aorta is rare in infants. A 12-month-old infant developed a mycotic aneurysm of the ascending aorta secondary to group A streptococcus septicemia. He developed atrioventricular block, and the rapid aneurysm progression under medical therapy prompted us to perform an emergency operation. The aneurysm was successfully repaired using an autologous pericardial patch. He remained well with normal sinus rhythm and was developing normally at the 5-year follow-up.
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