Difficulties in the differential diagnosis of left ventricular aneurysm - a case report. A case of a 55-year-old male with a post- infarction left ventricular aneurysm is described. The results of such non-invasive tests as echocardiography, angiography and magnetic resonance did not allow to differentiate between true and false aneurysm. The patient underwent successful surgery which revealed the presence of true left ventricular aneurysm. Difficulties in the differentiation between true aneurysm and pseudoaneurysm are discussed.