What are the two causes of cyst-like structures in the interventricular septum on echocardiography? An echinococcal cyst or rupture of a Sinus of Valsalva aneurysm into the interventricular septum.

The reverse Bernheim effect occurs when there is right ventricular pressure and volume overload that results in the interventricular septum bulging toward the left ventricle causing left ...