Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Single portable view of the chest is compared to previous exam from ___ . As on prior , the lungs are hyperinflated with parenchymal changes suggestive of emphysema , particularly at the left lung apex . Increased interstitial markings are identified at the left lung base . Elsewhere , the lungs are grossly clear . Cardiomediastinal silhouette is within normal limits . Osseous and soft tissue structures are unremarkable . Linear patchy at the right lung base is compatible with atelectasis versus scarring .
    OUTPUT:
    
Increased interstitial markings at the left lung base , potentially due to chronic changes ; however , in the proper clinical setting , component of infection is also possible . Two views of the chest may help further characterize .