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A, Photomicrograph shows the tumor specimen to be of low cellularity and the presence of cells with oval nuclei arranged in an irregular manner. These are areas consistent with the Antoni A tissue pattern characteristic of schwannoma (hematoxylin and eosin/saffranin, original magnification, ×300).
B, Diffuse reactivity for S-100 protein antibody is present in the specimen. This protein is found in high concentrations within Schwann cells (S-100 stain, ×300).
