title: Pulmonary histiocytosis X.
mesh_terms: D003937:Diagnosis, Differential; D006646:Histiocytosis, Langerhans-Cell / Q000175:diagnosis / Q000503:physiopathology*; D006801:Humans; D008168:Lung / Q000000981:diagnostic imaging; D008171:Lung Diseases / Q000175:diagnosis / Q000503:physiopathology*; D008854:Microscopy, Electron; D011859:Radiography; D013964:Thyroid Neoplasms / Q000175:diagnosis