Pseudo Atrium?: A Rare Presentation of Interventricular Septal Dissection Extending Into the Left Atrium

Interventricular septal dissection is a rare complication of myocardial infarction. In cases with few left-to-right shunts in the ventricular septal perforation, interventricular septal dissection expands in the chronic phase. It is rare for the interventricular septal dissection to extend from the ventricular septum to the left atrial free wall. (Level of Difficulty: Intermediate.)