Figure 2: Lymphocytic Interstitial Pneumonia (LIP). A. Alveolar septal nodular lymphocytic infiltrate (hematoxylin & eosin, x40). B. Kappa predominance within plasma cell population in 2010 wedge biopsy (in-situ hybridization, x200). C. Plasma cells (CD138 immunohistochemical staining, x200). D. Lambda expression within plasma cell population in 2010 wedge biopsy (in-situ hybridization, x200).