Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: A single view of the chest demonstrates low volumes , but no focal opacities to suggest pneumonia . There is bibasilar atelectasis . Enlarged cardiomediastinal contour reflects low lung volumes . Breast prostheses are noted . There is no pneumothorax or pleural effusion .
    OUTPUT:
    
Low lung volumes , but no evidence of pneumonia .