Most result from myocardial infarctions and occasionally can occur from blunt chest trauma.
Present as true or false aneurysms.
True aneurysms consist of all three layers of the heart epicardium, myocardium and endocardium.
False aneurysm is the result of free wall rupture that is contained by the pericardium.
If it ruptures on the free wall, it will cause cardiac tamponade.
If it ruptures on the intraventricular septum, it can create a ventricular septal defect.