Echocardiogram: Posterior Mitral Valve Leaflet Aneurysm

Posterior mitral valve leaflet aneurysms are extremely rare complications of infective endocarditis of the aortic valve. Destruction of the aortic valve results in a regurgitant jet that strikes the anterior leaflet of the mitral valve, creating a secondary site of infection leading to the development of an aneurysm. Perforation of these aneurysms may occur, resulting in mitral regurgitation and pulmonary edema from a ventricle already volume overloaded from aortic regurgitation.