Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral chest radiograph demonstrates hypoinflated lungs with crowding of vasculature and left lower lobe atelectasis . No pleural effusion or pneumothorax . Heart size , mediastinal contour , and hila are unremarkable . Left chest pacer defibrillator device leads are intact and in appropriate position within the right atrium and right ventricle . Limited assessment of the abdomen demonstrates 2 biliary stents . No free intraperitoneal air .
    OUTPUT:
    
Hypoinflated lungs with left lower lobe atelectasis . No pneumonia .