THE MAJORITY of ventricular aneurysms are believed to be acquired; aneurysms of the membranous portion of the ventricular septum, in contrast, are thought to be congenital in origin.1 This congenital anomaly is a rare lesion usually not diagnosed clinically and is often rather an incidental finding at autopsy; it may occur alone or with other cardiovascular anomalies and seldom produces clinical manifestations.2
We have recently observed such a lesion in association with ventricular septal defect and mild aortic stenosis.
Report of a Case
The patient was a 15-year-old white male student who was admitted to Hahnemann Medical College and Hospital on Aug 8, 1962, for evaluation of a heart murmur which was first noticed when he was two years of age. He has been asymptomatic throughout life. His physical growth and development were normal and he had not been restricted from any physical activity. His past medical history