We observed an unusual case of interventricular septal wall dissection
in a patient with a prior myocardial infarction. Echocardiography, ma
gnetic resonance imaging, and left ventriculography revealed separatio
n of the right-side and left-side walls of the interventricular septum
with an accessory chamber between the two walls. Morphologic findings
were consistent with interventricular septal dissection.