Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The left hemidiaphragm is elevated and the left lung appears to have decreased volume as compared to the right . Interstitial markings appear increased bilaterally but more so on the left . There is also left perihilar opacity . Findings could be due to asymmetric pulmonary edema on top of chronic lung disease , however atypical infection is not excluded . No pleural effusion is seen . There is no pneumothorax . The cardiac silhouette is top - normal to mildly enlarged . Mediastinal contours are unremarkable .
    OUTPUT:
    
Possible asymmetric pulmonary edema overlying chronic lung disease however underlying infection may be present .