Table 1 Diseases that may cause pulmonary cysts

Centrilobular emphysema

Lymphangioleiomyomatosis

Langerhans cell histiocytosis

Lymphoid interstitial pneumonia

Pulmonary metastases (squamous/adenocarcinoma)

Cystic fibrohistiocytic tumour of the lung

Subacute (± chronic) hypersensitivity pneumonitis

Barotrauma/ARDS

Pulmonary infection—pneumatocoeles

Desquamative interstitial pneumonia

Necrobiotic nodules (end stage)

Birt Hogg Dubé syndrome

Tracheal papillomatosis

Cystic mesenchymomas

Light-chain disease