PMC8203063_01
Chest X-ray image showing complete opacification of the left lung.
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F1
A chest X-ray image at the time of initial assessment revealed complete opacification of the left lung with associated air bronchogrammes noted in the left perihilar region (Fig. 1).
Chest computed tomography image confirming consolidation of the left lung
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F2
Chest computed tomography analysis confirmed dense consolidation of the left lung with no evidence of atelectasis or pleural effusion (Fig. 2).   In view of the clinical problem of a non-resolving pneumonia, the differential diagnoses included atypical pneumonia, non-tuberculous mycobacterial disease, primary lymphoma of the lung and slow-growing primary lung neoplasms.
Intermediate magnification micrograph of lung biopsy histology revealing lepidic growth pattern of neoplastic cells after haematoxylin and eosin staining
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F3
T-cell response. Transbronchial lung biopsies, however, revealed tumour tissue with the appearance of a well-differentiated mucus-secreting adenocarcinoma with lepidic features (Fig. 3).  Immunohistochemical staining for cytokeratin 7 (CK7), thyroid transcription factor-1 (TTF-1) and napsin