Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lungs are hyperinflated . There is no pleural effusion , pneumothorax or focal airspace consolidation worrisome for pneumonia . A rounded opacity at the left lung base may be a confluence of structures or within the overlying osseous structures , however , shallow obliques are recommended for further evaluation . Heart is mildly enlarged . Mediastinal and hilar contours are unremarkable .
    OUTPUT:
    
No pneumonia . Rounded opacity left lung base may be a confluence of structures or osseous in nature for which repeat lateral film is recommended for further evaluation .