Extramedullary Plasmacytoma Diagnosed in an HIV-Positive Patient by an Unusual Clinical Presentation

Figure 3

Microscopic examination revealed a plasma cell tumor. The histological sections showed lymphoid origin of tumor fragment characterized by the proliferation of atypical plasma cells which are arranged in sheets (a, HE); immunohistochemical reactions were positive for plasm cell (b); negative for kappa (c); and positive for lambda (d).