Figure 3: Extranodal Marginal Zone Lymphoma (ENMZL). A. Needle core biopsy showing lung parenchyma with dense lymphoplasmacytic infiltrate (H&E, x100). B. Numerous plasma cells (CD138 immunohistochemical staining, x200). C. Numerous plasma cells, plasmacytoid lymphocytes, and small lymphocytes (H&E, x400). D. ENMZL showing extensive plasmacytic differentiation with numerous Russell bodies (arrow) and Mott cells (arrowhead) (H&E, x500 oil).