Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is a rounded opacity in the left mid lung zone . The chronic left pleural effusion is slightly bigger . The small right pleural effusion is stable . The cardiomediastinal silhouette is unchanged . Multiple calcified hilar lymph nodes are noted .
    OUTPUT:
    
1 . Left mid lung opacity , most concerning for pneumonia . Continued followup after treatment is recommended as an underlying mass can not be fully excluded . 2 . Increase in size of the moderate left pleural effusion and stable small right pleural effusions .