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Calcification in lung lesions includes many differential diagnoses and usually indicates a benign course. However, its interpretation is challenging due to many etiologies. Radiological visualization of extensive calcification in bronchogenic carcinoma is not familiar and may cause confusion and misdiagnosis; however, it may be rarely seen and has also been rarely reported. We documented a case of lung adenocarcinoma with extensive calcification in computed tomography (CT) of chest and diagnosed as mucinous adenocarcinoma of the lung by bronchoscopic lung biopsy. [ABSTRACT FROM AUTHOR]

Crystalline silica inhalation causes silicosis, one of the ancient occupational lung diseases. It leads to an irreversible fibrotic response in the lung parenchyma and, consequently, causes diffuse interstitial lung disease. Asymptomatic to chronic irreversible forms are various presentations of silicosis, which has a high-risk predisposition to various comorbidities. We documented two cases of rare presentations of silica dust exposure alveolar silicoproteinosis and silicotuberculosis. [ABSTRACT FROM AUTHOR]