An 85-year-old man was diagnosed with Multiple Myeloma, clinical stage IIIB. He presented with renal failure, anemia, thrombocytopenia, multiple lytic areas of skull, and a narrow band in γ-globulin region. A monoclonal IgG/Kappa immunoglobulin in both serum and urine was found. Bone marrow examination showed 20% atypical plasma cells, almost all of them containing numerous large azurophilic, bright red, cytoplasmic inclusions on May-Grünwald-Giemsa staining with strong positivity to alpha-naphtyl acetate esterase and acid phosphatase (Fig. 1).
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