Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is a new small left pleural effusion . There is a new irregular opacity at the left lung base laterally , which could be an infectious process or atelectasis . A calcified granuloma in the left mid to upper lung is unchanged . Cardiomediastinal silhouette is normal size .
    OUTPUT:
    
New small left pleural effusion and left lung base opacity could be an infectious process or atelectasis . If clinically indicated , CT is recommended for further evaluation .