A helpful hint for chest radiology: "look behind the heart".
Pathologic abnormalities on frontal chest radiographs are often located solely or partially in the retrocardiac region. It is essential to include a look behind the heart when viewing the frontal x-ray. Cases of pneumonia, metastases, and posterior mediastinal mass, all of which would have been missed without a look behind the heart, are used to illustrate this precept.
D000293:Adolescent; D002648:Child; D002675:Child, Preschool; D006801:Humans; D008175:Lung Neoplasms / Q000000981:diagnostic imaging / Q000556:secondary; D008297:Male; D011014:Pneumonia / Q000000981:diagnostic imaging*; D013902:Radiography, Thoracic; D012512:Sarcoma, Ewing; D009396:Wilms Tumor