<unk><unk>  remains the gold standard test to evaluate for the presence of and to subclassify the type of<unk> .  A small tissue sample of the endocardium and myocardium is obtained via right sided cardiac catheterization. The sample is then evaluated by a pathologist using immunochemistry and special staining techniques as necessary.  Histopathological features include abundant edema in the myocardial interstitium and an inflammatory infiltrate which is rich in lymphocytes and macrophages.  Focal destruction of myocytes as a result of the inflammatory process results in left ventricular dysfunction.<unk><unk>  is recommended when the results would identify an underlying disease that is amenable to therapy.  Routine performance of<unk><unk>  is not recommended in all patients with<unk> .
Myocarditis endomyocardial biopsy
Myocarditis echocardiography
Myocarditis MRI
Arrhythmogenic right ventricular dysplasia endomyocardial biopsy
Myocarditis CT scan
Endocarditis MRI
Cardiac amyloidosis cardiac biopsy
Noncompaction cardiomyopathy echocardiography