Subepicardial aneurysm detected during diagnosis of acute cardiac failure.

A 55-year-old female developed dyspnea at night and visited our hospital. A diagnosis of acute cardiac failure was made and the patient was immediately admitted. A false ventricular aneurysm with blood flow was found in the lateral wall of the left ventricle. Past history of myocardial infarction was not clear. Repeated cardiac failure may have resulted from decreased cardiac output by increased blood flow in the aneurysm due to its expansion. After patch closure was performed, the symptoms improved.