A pulmonary mass is any area of pulmonary opacification that measures more than 30 mm, an arbitrary but useful measurement. The commonest cause of a pulmonary mass is primary lung cancer 1-3:
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granuloma: most common non-malignant cause
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non-granulomatous infection
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other malignancy
pulmonary lymphoma: primary or secondary
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mucoid calcification of mucinous adenocarcinoma
gastrointestinal tract adenocarcinoma
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dystrophic calcification
treated pulmonary metastases
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bone forming / cartilage mineralization
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schwannoma: rarely endobronchial 2
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lung mass mimics
Castleman disease: hilar mass may mimic lung lesion
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