Serum Free Light Chain Only Myeloma with Cytoplasmic IgM

Figure 3

Bone marrow and specimen from the sacral mass. ((a), (b)) Immunostaining for CD138 in the bone marrow clot section showing microcluster infiltration of plasma cells (x40, x200). (c) Bone marrow aspiration smear showing atypical plasma cells (May-Giemsa stain x600). ((d)–(j)) Specimen of sacral mass. (d) Hematoxylin and eosin (H&E) stain showing diffuse infiltration of plasma cells. Immunohistochemical stain showing (f) IgM+, (h) lambda light chain+, (i) CD138+, (e) IgG−, (g) kappa light chain−, and (j) CD20−.

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