Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: No previous chest x-ray on PACS record for comparison . The lungs may be slightly hyperinflated . The heart is not enlarged . Within the limits of plain film radiography , no hilar or mediastinal lymphadenopathy is detected . Aortic knob is within normal limits radiographically . There is biapical pleural thickening . Given the symmetry , this is unlikely to represent post - traumatic apical capping . The right hemidiaphragm is elevated and ? slightly eventrated . No CHF , focal infiltrate or effusion is identified .
    OUTPUT:
    
No acute pulmonary process identified . No widening of the mediastinum identified . If there is high concern for aortic dissection , then cross-sectional imaging could help for further assessment .