Accidental detection of a giant right atrial aneurysm in an asymptomatic infant

We present a 4-month old infant boy accidentally detected to have cardiomegaly on a chest radiograph, and on further investigation discovered to have a giant right atrial aneurysm and a secundum atrial septal defect. Congenital right atrial aneurysm or diverticulum is a rare anomaly, usually presenting with atrial or supraventricular tachycardia. Previously reported patients did not have any associated congenital heart defect. Although asymptomatic our patient needs close follow-up, and surgical resettion of the aneurysm and closure of the atrial septal defect in view of potential complications.