[Rupture of Left Ventricular Pseudo-false Aneurysm after Myocardial Infarction].

We herein present a case of ruptured left ventriclular pseudo-false aneurysm. A 73-year-old female had acute myocardial infarction due to occlusion of the left circumflex artery, and subsequently underwent percutaneous coronary intervention. Three weeks later, however, the patient suddenly fell into a state of shock. Contrast-enhanced computed tomography (CT) revealed rupture of left ventricular aneurysm, and emergency surgery was performed. A ruptured aneurysm was observed in the posterior wall, and as the wall of the aneurysm was fragile, it was repaired using double-patch technique. Histopathological examination revealed myocardial cells in the aneurysm wall, confirming diagnosis of pseudo-false aneurysm. Pseudo-false aneurysm is a rare type of left ventricular aneurysm. In cases of rupture in acute or subacute phase of myocardial infarction, when the aneurysm wall is fragile, double-patch repair technique effectively ensures hemostasis and prevents future aneurysm formation.