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(A) Adult T-cell leukemia/lymphoma (ATLL) infiltration of endocardium and myocardium (H&E, 20×). (B) Higher magnification of infiltrating lymphoma showing pleomorphism, scant eosinophilic cytoplasm, irregular nuclear contours with coarse chromatin and variably prominent nucleoli (H&E, 200×). The lymphoma cells were strongly positive for CD4 (C) and CD25 (D) by immunohistochemistry (20×).
