title: Diffuse pulmonary disease in a 2 1/2-year-old child.
mesh_terms: D001706:Biopsy; D002675:Child, Preschool; D003937:Diagnosis, Differential; D006646:Histiocytosis, Langerhans-Cell / Q000000981:diagnostic imaging*; D006801:Humans; D008168:Lung / Q000473:pathology; D008171:Lung Diseases / Q000000981:diagnostic imaging*; D008297:Male; D011859:Radiography