Histiocytosis X with anterior mediastinal mass as its initial manifestation.
D006646:Histiocytosis, Langerhans-Cell / Q000000981:diagnostic imaging* / Q000473:pathology; D006801:Humans; D007223:Infant; D008171:Lung Diseases / Q000000981:diagnostic imaging* / Q000473:pathology; D008297:Male; D008482:Mediastinum / Q000000981:diagnostic imaging; D011859:Radiography