Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There are low lung volumes with linear atelectasis bilaterally . Heart size is and mediastinal contours appear stable from ___ . There is no definite evidence pneumonia . No pleural effusion or pneumothorax . Osseous structures are intact .
    OUTPUT:
    
Low lung volumes with bibasilar atelectasis , but no definite evidence of pneumonia .