Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The heart size is within normal limits . The mediastinal and hilar contours are normal . The lungs demonstrate streaky opacities in the retrocardiac space , compatible with atelectasis or bronchiectasis . There is no pleural effusion or pneumothorax . Lateral view shows progression of heavy coronary atherosclerosis in the left anterior descending artery .
    OUTPUT:
    
Retrocardiac atelectasis or bronchiectasis , but no pneumonia . Coronary atherosclerosis .