Lymphocytic myocarditis: A histopathologic definition and classification from the Society for Cardiovascular Pathology and Association for European Cardiovascular Pathology. II: Surgical and autopsy specimens

Lymphocytic myocarditis, characterized by lymphocyte-predominant myocardial inflammation with associated myocyte injury, is a term that has decades-old histopathologic criteria when encountered on endomyocardial biopsy. However, the interpretation of non-biopsy specimens such as surgical resections and autopsy samples has lacked standardized histopathologic criteria, despite their growing clinical and forensic relevance. The aim was to develop and establish criteria for the diagnosis and classification of lymphocytic myocarditis in non-biopsy ventricular myocardial specimens.