Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is persistent right middle lobe atelectasis unchanged from ___ . There is no focal consolidation , pleural effusion , or pneumothorax . The aorta is torturous . The heart size is within normal limits .
    OUTPUT:
    
Unchanged right middle lobe atelectasis dating back to ___ . No evidence of pneumonia .