Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral views of the chest provided . Subtle opacity in the left lung base is noted which could represent a trace effusion , difficult to exclude a very subtle pneumonia . Right lung is clear . Cardiomediastinal silhouette is normal . Bony structures are intact
    OUTPUT:
    
Probable tiny left pleural effusion with very subtle opacity in the left lower lung which could represent a very early pneumonia .