Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lungs are slightly hyperinflated with focal subtle opacity in the left mid lung zone best seen on frontal projection . This may represent a infectious process . There are no other areas of focal consolidation , pleural effusion , mass or evidence of pneumothorax . No hilar adenopathy noted . Mediastinal silhouette is within normal limits . The pleural surfaces are unremarkable .
    OUTPUT:
    
Left middle lung zone opacity which may represent an infectious process in the appropriate clinical setting .