Pneumocystis jirovecii Pneumonia in an Immunocompetent Japanese Man: A Case Report and Literature Review

Figure 3

(a) A photomicrograph (original magnification, ×40; hematoxylin-eosin staining) of a section of lung tissue. The section showed homogeneous septal thickening and intra-alveolar eosinophilic exudate. (b) A high-power photomicrograph (original magnification, ×400; hematoxylin-eosin staining) of a section of lung tissue showed thickening of the alveolar septa due to both chronic inflammation and a small amount of collagen. The intra-alveolar spaces were filled with foamy acellular eosinophilic exudate. (c) A high-power photomicrograph (original magnification, ×400; Grocott's methenamine silver staining) of a section of lung tissue. Numerous cysts of Pneumocystis jirovecii were observed within the intra-alveolar foamy exudate.

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