Cardiovascular Imaging

Aneurysm, ventricular septal

irregularly shaped sac projecting from the membranous portion of the ventricular septum into the right ventricular chamber. The aneurysm may have the configuration of a windsock during systole, and may have a small septal defect at the tip or adjacent to it. The ventricular septum may be intact. Rarely, the aneurysm projects into the right atrium. It is believed that the aneurysm forms during closure of a membranous ventricular septal defect from thinned septal tissue or the septal leaflet of the tricuspid valve adherent to the defect. Infrequently, there is significant right ventricular outflow obstruction or tricuspid insufficiency. Right ventricular angiography may disclose a filling defect in the right ventricle while left ventricular angiography produces opacification of the windsock or scallops-shaped aneurysm with or without a left to right shunt.

CBH