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Biopsy, left retroauricular mass: Plasmacytoma.
of retroauricular mass shows skeletal muscle which is heavily infiltrated by
plasma cells. While many of these are almost normal appearing, there are several
extremely atypical cells with enlarged nuclei, prominent nucleoli and an
increased nuclear-to-cytoplasmic ratio. The biopsy is crushed and little
material was left on the immunoperoxidase slides, but these appear to show that
the lesion stains for IgG kappa.