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The underlying etiology of dilated cardiomyopathy (DCM) in children varies, 14–22 % is secondary to myocarditis, and the majority remains idiopathic. Etiology has prognostic value; however, ‘a clinical diagnosis of myocarditis’ has been frequently used because the gold standard [endomyocardial biopsy (EMB)] is often not performed. Therefore, a consistent diagnostic approach and interpretation is needed...