ANEURYSM OF THE MEMBRANOUS VENTRICULAR SEPTUM PRODUCING SUBPULMONIC OUTFLOW TRACT OBSTRUCTION

The authors report the case of a 31-year-old asymptomatic male who, fo llowing investigations for cardiac murmur, was found to have congenita lly corrected (status solitus of the atria, left looping of the ventri cles, leftward aorta in relation to the pulmonary artery [S,L,L) trans position of the great vessels with significant right-sided ventricular outflow tract obstruction due to a large aneurysm of the membranous v entricular septum. Diagnosis was made with transesophageal echocardiog raphy and confirmed during corrective surgery. The authors review the literature with regard to aneurysms of the membranous ventricular sept um and their association with congenital heart disease, and they discu ss the use of noninvasive tests aiding the diagnosis.