Primary pulmonary plasmacytoma accompanied by overlap syndrome: A case report and review of the literature

Figure 1 Computed tomography scan of the chest revealed an irregular mass (orange arrows) located in the middle and inferior lobe of right lung. A: Chest computed tomography image displayed at lung window showing a mass in the middle and inferior lobe of right lung, which caused bronchial obstruction of the lateral segment of the right middle lobe and the right lower lobe; B: Chest computed tomography image displayed at mediastinal window on a plain scan showing that the mass was lobulated, inhomogeneous, and accompanied by spotted calcification; C: Enhanced scanning in the artery phase showed that the mass displayed moderate ununiform reinforcement with multiple tiny blood vessels.

Figure 2 Histopathological examinations. A: The pathological findings of the right lung lesion showed the infiltration of numerous plasma cells under the microscope, the nuclei were in different sizes, and the nucleoli were large and often offset (Hematine-eosin staining, × 40); B: Immunohistochemistry suggested that the right lung tumour cells were positive for CD138, which was specific to plasmacytomas; C: The right lung tumour cells were positive for CD38 on immunohistochemistry staining.