Ventricular septal aneurysm after atrioventricular septal repair with pericardium

A 2-month-old infant underwent a two-patch repair of a type C atrioventricular septal defect using autologous pericardium. Several months later a large, symptomatic aneurysm of the ventricular septal patch developed, requiring resection. The use of untreated autologous pericardium for large, congenital ventricular septal defects is unpredictable and should be avoided.