Preoperative magnetic resonance imaging. Left ventricular outflow tract. Giant left ventricular aneurysm of the lateral wall, strictly confined to the submitral region between anterolateral and posteromedial papillary muscle. Narrow aneurysma neck stretching in length from the apex up to 1 cm below the mitral valve annulus with the aneurysmal sac bulging to the thoracic wall. Signal alteration as sign of blood stasis in left ventricle. Spontaneous contrast on echocardiography. Of note: thin aneurysmal sac.