Echocardiographic diagnosis of an aneurysm of the membranous ventricular septum.

A patient with a small ventricular septal defect complicated by an aneurysm of the membranous ventricular septum is reported. The aneurysm was diagnosed by left ventricular angiocardiography and, non-invasively, by echocardiography. The clinical significance of the anomaly is discussed in relation to the pertinent literature.