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Histological and immunohistochemical findings. Histopathology of the lymph node (hematoxylin and eosin [H&E] staining) shows a palisade of tumor cells with a high nuclear/cytoplasmic (N/C) ratio and nuclear fission. Immunostaining reveals positivity for CD56, synaptophysin, and chromogranin A. (A) H&E staining, bar: 20 μm. (B) Synaptophysin staining, bar: 20 μm. (C) CD56 staining, bar: 20 μm. (D) Chromogranin A staining, bar: 20 μm. (A–D) Magnification, ×40
