TTR and amyloidosis: Examination of endomyocardial biopsy from right ventricle. Histological detection of cardial amyloidosis with focal and diffuse amyloid pattern. Positive immunohistological staining for transthyretin. Negative staining for different lambda and kappa light chain antibodies. Altogether wtATTR-CM. Start of tafamidis treatment (61 mg/day)