Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: A dual lead left cardiac pacemaker defibrillator device appears intact and unchanged in position . Lung volumes are low . Increased opacity in the left are now the reflect increasing atelectasis . No edema . No effusion . Heart size is top normal . Scattered clips project over the upper abdomen , unchanged .
    OUTPUT:
    
Increased left lower lobe opacity most likely atelectasis . No pneumonia .