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Differential diagnosis of Langerhans cell histiocytosis. Nodular LCH: - Sarcoidosis: perilymphatic distribution. - Metastases: random distribution. Cystic LCH: - LAM: round cysts, evenly distribution in women in the child-bearing age - Cystic bronchiectasis: 'signet ring sign'. - Centrilobular emphysema: no walls, central dot. - LIP #Clinical #Diagnosis #Radiology #CTChest #Cystic #Cysts #Differential #Comparison #Table #RadiologyAssistant