Inferior cardiac aneurysm involving the interventricular septum. A complication of an acquired ventricular septal defect.

An acquired ventricular septal defect led to the formation of an unusual aneurysm within and overlying the posteroinferior part of the interventricular septum. This is a rare complication of a myocardial infarction and may not have been reported before. The aneurysm probably developed because of a combination of the anatomical localisation of the small ventricular septal defect and the long survival of the patient after its formation.