Type I

Abrupt slit-like tear that generally occurs within 24 hours of an acute myocardial infarction (without thinning)

Type II

Erosion of the infarcted myocardium, which is suggestive of a slow tear of the dead myocardium and typically occurs more than 24 hours after the infarction. The infarcted myocardium erodes before rupture and is

covered by a thrombus

Type III

Early aneurysm formation and subsequent rupture. i.e., perforation of a previously formed aneurysm