Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is mild cardiomegaly . The lungs are hyperexpanded , suggesting air trapping . There may be slightly increased retrocardiac opacification , which in the proper clinical setting could reflect an early pneumonia . The pulmonary vasculature is slightly indistinct , which may reflect the earliest phase of pulmonary edema . There is no pleural effusion or pneumothorax .
    OUTPUT:
    
1 . Moderate hyperexpansion suggestive of air trapping . 2 . Equivocal retrocardiac opacification , possibly an early pneumonia 3 . Equivocal obscuration of the pulmonary vasculature , possibly early pulmonary edema .