So-called inflammatory pseudotumor (IPT) affects almost all major organs. The histological appearance of IPT varies from fibrohistiocytic proliferation to plasma cell-dominated lesions. The latter are composed of numerous plasma cells, lymphocytes, and histiocytes as well as mesenchymal cells, that is, plasma cell granuloma (PCG). Recently, Zen et al. demonstrated that some of the pulmonary PCG...
