... DIFFERENTIAL DIAGNOSIS Dilated Cardiomyopathy. The ventricular dilatation of ACM may closely mimic that seen in dilated cardiomyopathy (DCM). Also, occasional foci of subepicardial fibrofatty change are seen in DCM. However, this is typically not a prominent finding, and it is unusual to see these findings...

... replacement in some areas (particularly the anterior portion and the acute margin) ( fig. 21-8 ). Such fatty replacement of the wall may mimic arrhythmogenic cardiomyopathy (ACM) (see chapter 17 ). Unlike ACM, this type of fatty change in obesity is not typically associated with significant interstitial...

... (ACM) pathologically; however, the presence of extracardiac myopathy is absent in ACM. Striking myocyte loss and fibrofatty replacement has been described in EDMD as well, particularly in the sinoatrial and atrioventricular conducting tissues ( 3 ). Dystrophin-Associated Myopathies...