Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The cardiomediastinal and hilar contours are stable , with moderate cardiomegaly . A left chest wall AICD device is seen with a single lead in the expected position of the right ventricle . The lung volumes are extremely low , resulting in crowding of the bronchovascular marking . Streaky opacity in the right lung base , likely represents atelectasis . An air space opacity in the right upper ___ , ___ represent a site of infection . No pleural effusion or pneumothorax is seen . Moderate - sized hiatal hernia is re-demonstrated .
    OUTPUT:
    
Low lung volumes with crowding of the bronchovascular markings . Air space opacity in the right upper ___ , ___ represent a site of infection .