Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Small left pleural effusion is seen , similar to prior to possibly slightly decreased . . Patchy left base opacity is again seen which may relate to pneumonia . The cardiac and mediastinal silhouettes are grossly stable . No pneumothorax is seen .
    OUTPUT:
    
Left pleural effusion , possibly slightly decreased . Left base consolidation again seen .