Case Report

Extranodal NK/T Cell Lymphoma Causing Cardiorespiratory Failure

Figure 4

Microscopic appearance of lymphoma infiltrate in the heart. (a) Hematoxylin and eosin stain shows lymphoid cells infiltrating the myocardium (×100). (b) Medium sized atypical lymphoid cells with abundant pale cytoplasm, irregular nuclear contour, granular chromatin, and inconspicuous nucleoli (×400). (c) Lymphoma cells are immunohistochemically positive for CD3 with cytoplasmic staining pattern (×400). (d) Lymphoma cells are immunohistochemically positive for granzyme B (×400).
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