Concurrent Polycythemia of Undetermined Etiology and Smouldering Plasma Cell Myeloma

Figure 2

Evidence of a plasma cell neoplasm. (a) Touch prep of the bone marrow biopsy showing numerous plasma cells (arrow, 50x). (b) IHC staining for the plasma cell marker CD138 (10x). (c) Flow cytometric dot plot of CD38/CD138-positive plasma cells from the bone marrow aspirate showing a monotypic lambda-restricted plasma cell population.

(a)

(b)

(c)