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Endomyocardial biopsy findings in a proband affected by a diffuse form of ARVC/D. All three biopsy samples are from different regions of the RV free wall. There is extensive fibro-fatty tissue replacement with myocardial atrophy that is a major criterion, i.e. residual myocytes <60% by morphometric analysis, or < 50% if estimated. (Contributed by C. Basso, Padua, Italy)
