Aneurysm of the membranous ventricular septum.

Aneurysm of the membranous portion of the interventricular septum is considered to be a rare congenital anomaly, and to date only a few publications have documented ante-mortem diagnoses. Taussig (1960) reviewed the published reports and was able to find 80 cases diagnosed at necropsy. Steinberg (1957), using angiocardiographic studies, reported the first living patient with this defect. Two recent reports brought the total number discovered by angiocardiography to 7 (Kasparian, Brest, and Novack, 1965; Edelstein and Charms, 1965). Using selective left ventricular angiocardiography we have found 10 patients at this centre during the past two years.