Diffuse cystic lung diseases (DCLDs) are uncommon and frequently misdiagnosed, in part because there are so many different causes. The most frequently encountered DCLDs in clinical practice are lymphangioleiomyomatosis (LAM), Birt-Hogg-Dubé syndrome (BHD), and pulmonary Langerhans cell histiocytosis (PLCH).1 But cystic lung disease can also be due to Light Chain Deposition Disease or a rare
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