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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]