PMC6307102_01
The chest CT showed bilateral areas of consolidation and little pleural effusion in the left (A). After antibiotic treatment, the chest CT scan revealed less pleural fluid and unchanged consolidation (B).
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His chest CT showed bilateral consolidation in the right upper and middle lobes and the left upper lobes (Fig. 1A). However, the chest CT scan revealed less pleural fluid and an unchanged consolidation (Fig. 1B).
H&E staining showed that the normal alveolar structure had completely disappeared, being substituted by diffuse lymphoid cells infiltration. These lymphoid cells included small and round lymphoid cells, centrocyte-like cells and monocytoid-resembling lymphocytes. (Magnification  40) (A); Immunohistochemical test indicated that the cells were positive for CD20 (B), Bcl-2 (C), CD79a (D).
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These lymphoid cells included small round lymphoid cells, centrocyte-like cells and monocytoid-resembling lymphocytes (Fig. 2 A).