Acquired left ventricular pseudoaneurysm is a rare disorder that occurs after acute myocardial infarction. We present a 55 year-old male patient with a nonruptured pseudoaneurysm after acute MI presenting with severe mitral regurgitation. After resection of sac-like lesion, the defect was 5 cm diameter posterolaterally left ventricular. The aneursym was repaired with pericardium patch to maintain cardiac geometry that diminishes mitral regurgitation without intervention to mitral valve.