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  • Title: [IgG-kappa type multiple myeloma with cytoplasmic crystalline inclusions].
    Author: Kobayashi C, Tanabe J, Aoki M, Suzuuki R, Asai H, Kurita M, Murata T, Mohri H.
    Journal: Rinsho Ketsueki; 2007 Aug; 48(8):652-8. PubMed ID: 17867303.
    Abstract:
    An 82-year-old male was admitted to our hospital because of anemia with Hb 6.9/dl. The serum monoclonal IgG of the kappa type was detected. Bone marrow aspiration showed the presence of 38.9% atypical plasma cells with crystalline inclusions. These crystalline inclusions were stained with acid phosphatase, and remained unstained with MPO, PAS and Congo-Red staining. Immunofluorescence studies showed the plasma cells were positive for IgG-kappa type immunoglobulin and CD138. Electron microscopy revealed varying numbers of stick-like, rod-shaped, rhomboid or rectangular crystals of a variety of lengths and sizes with a periodicity giving an appearance of longitudinal striation. The inclusions were most often surrounded by ribosomes. Some crystalline inclusions were located in the rough-surfaced endoplasmic reticulum. Their presence was probably due to an abnormality in the synthesis and/or secretion of immunoglobulin.
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