Histopathology of LyGa. The pattern of infiltration is diffuse (A; case 1; 20× objective). Atypical NK cells occasionally infiltrate the glandular epithelium (arrow), showing lymphoepithelial-like lesions by NK cells (B; case 10; 40× objective). Some atypical cells harbor large eosinophilic granules in the cytoplasm (C; case 3; 100× objective). In some cases, the nucleoli are prominent (arrow; D; case 5; 100× objective). Figures were taken with a microscope (BX51; Olympus) and a digital camera (KY-F75; Victor). Microsoft PowerPoint 2007 was used for image processing. Numeric apertures: 20×/0.40 (A), 40×/0.75 (B), 40×/0.95 (C), 60×/0.90 (D).