PMC9526182_01
Chest computed tomography scan at admission (A), 12d later (B), 21d later (C), 33d later (D), 40d later (E), and 54d later (F).
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Chest computed tomography (CT) showed a patchy high-density shadow spread in the lower lobe of the left lung, as well as the presence of an air bronchogram sign (Fig. 1 A). Re-examination of chest CT indicated that the pneumonia had progressed to more severe disease (Fig. 1 B). The white blood cell count and CRP levels were normal upon outpatient re-examination, and chest CT suggested gradual absorption of the lung lesions (Fig. 1 C-F).
Pathologic examination showed (hematoxylin-eosin staining, A: x 400, B: x 100): chronic inflammation of the respiratory tract mucosa with submucosal fibrovascular hyperplasia, and the surrounding lung tissue showed changes of organizing pneumonic.
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On day 4 after discharge, bronchoscopic lung biopsy revealed chronic inflammation of the respiratory tract mucosa with submucosal fibrovascular hyperplasia, and the surrounding lung tissue showed changes of organizing pneumonic (Fig. 2).