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Detailed algorithmic approach to cystic lung disease. It is important to exclude mimics of cystic lung disease before proceeding with the actual algorithm. BHD = Birt Hogg Dube syndrome; DIP = desquamative interstitial pneumonia; HRCT = high-resolution CT scan; LAM = lymphangioleiomyomatosis; LCDD = light-chain deposition disease; LIP = lymphoid interstitial pneumonia; PJP = pneumocystis jirovecii pneumonia; PLCH = pulmonary Langerhans cell histiocytosis.
