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(a) Microscopic examination showing infiltration of plasma cells (hematoxylin and eosin stain). (b) Immunohistochemical staining revealed CD138+ and EMA+ tumor cells. (c, d) PET-TC with increased metabolic uptake in the mass.
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Immunohistochemistry revealed CD138 + and EMA + tumor cells; with high proliferative activity, estimated with KI-67 (Fig. 1a, b). A positron emission tomography (PET) scan showed hypermetabolism in the mass without evidence of increased metabolic activity at another level (Fig. 1c, d).
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