Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Portable upright chest radiograph was obtained . Low lung volumes and patient body habitus limit assessment with unchanged bibasilar opacities , likely atelectasis . Mild interstitial edema is suggested by indistinct pulmonary vasculature and unchanged . Heart size is top normal . No appreciable pneumothorax is identified .
    OUTPUT:
    
Limited study with unchanged bibasilar likely atelectasis and mild pulmonary edema .