True and false left ventricular aneurysms. Propensity for the altter to rupture.

Two cases are described of sudden death resulting from rupture of small chronic false aneurysm of the left ventricle with secondary hemopericardium. The cases support the point that rupture of chronic false left ventricular aneurysm tends to occur. This appears to be contrary to the potential for chronic true aneurysms of the left ventricle which tend not to rupture. Rupture of true left ventriuclar aneurysm in its deveoping stahe may, however, occur.