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Histological examination showed massive atypical medium- to large-sized natural killer lymphocyte infiltrations with slightly irregular nuclear contours. A dispersed chromatin pattern and clear cytoplasm in the gastric mucosa, × 100 (A) and × 400 (B); Immunohistochemical stains showed CD3+ (C), CD4- (D), CD5- (E), CD7+ (F), CD8- (G), CD20- (H), CD56+ (I), T-cell restricted intracellular antigen-1+ (J), granzyme B+ (K) and Epstein-Barr virus-encoded RNA in-situ hybridization (L).
