Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lung volumes are low . The heart size is normal . The mediastinal and hilar contours are unchanged . The pulmonary vasculature is normal . There is no focal consolidation , pleural effusion or pneumothorax identified . Minimal retrocardiac atelectasis is demonstrated . There are no acute osseous abnormalities .
    OUTPUT:
    
Low lung volumes with retrocardiac atelectasis .