Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is a new small patchy opacity at the left lung base which could be a focal atelectasis or early developing pneumonia . The linear atelectasis or scarring at the lingula is similar to ___ . There is no pleural effusion , or pneumothorax . Cardiomediastinal and hilar silhouettes are normal size .
    OUTPUT:
    
There is a small patchy opacity at the left lung base which could be a focal atelectasis or early developing pneumonia .