title: Retrosternal density: a sign of pulmonary hypoplasia.
abstract: An anterior increased density, that parallels the posterior border of the sternum, was noted on the lateral radiograph of two children who were at first thought to have an accessory diaphragm. After a long follow-up and further investigations, it is now felt that this sign is solely due to upper lobe hypoplasia.
mesh_terms: D002675:Child, Preschool; D005260:Female; D006801:Humans; D007223:Infant; D008168:Lung / Q000002:abnormalities* / Q000000981:diagnostic imaging; D011859:Radiography; D013249:Sternum / Q000000981:diagnostic imaging*