Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is increased opacity at the left lung base , concerning for pneumonia in the proper clinical setting . There is no pleural effusion , pneumothorax , or pulmonary edema . The cardiomediastinal silhouette is enlarged but overall unchanged dating back to ___ .
    OUTPUT:
    
Increased opacity at the Left lung base , concerning for pneumonia in the proper clinical setting .