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A high-power photomicrograph of a brain tumor depicting a diffuse sheet of monomorphic cells. The cells are small, with eosinophilic cytoplasm, perinuclear Hoff bodies, and eccentrically placed nuclei. This is morphologically consistent with a plasma cell aggregate.
A CD138 immunohistochemical stain highlights the cells of interest (brown staining), confirming them to be plasma cells.