Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: AP portable view of the chest . The lungs are relatively hyperinflated . Linear opacities at the left lung base again suggestive of atelectasis versus scarring . Indistinct pulmonary vascular markings are seen particularly in the left upper and right lower lung . This could be due to asymmetric mild interstitial edema in the setting of the background of chronic lung disease noting that infection is also possible . The cardiac silhouette appears slightly enlarged . Median sternotomy wires again noted .
    OUTPUT:
    
Asymmetric increased interstitial markings potentially due to edema superimposed on underlying chronic lung changes versus infection .