Non-secretory multiple myeloma expressed as multiple extramedullary plasmacytoma with an endobronchial lesion mimicking metastatic cancer: A case report

Figure 2 Microscopic examination of the specimen using hematoxylin and eosin staining and immunohistochemistry staining. A-F: In the bronchus, plasmacytoid large atypical cells are densely infiltered beneath the surface epithelium. These cells are immunoreactive for kappa-light chain (B) and CD138 (F) but not for lambda-light chain (C), CD3 (D), and CD20 (E); G-I: The lesion in the nasal cavity also shows densely packed plasmacytoid cells and is positive for kappa-light chain (H) and negative for lambda light chain (I).