Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Portable upright chest radiograph demonstrates further interval improvement in bibasilar atelectasis , with probable small residual pleural effusion though this also is improved . There is no focal consolidation or pneumothorax . The cardiac silhouette and mediastinal contours are unchanged . The pulmonary vasculature is normal . An endotracheal tube , NG tube , and left chest biventricular AICD device are unchanged , and in standard position . A right subclavian catheter tip projects over the lower SVC .
    OUTPUT:
    
1 . Standard positioning of support devices and tubes . 2 . Further interval improvement in bilateral lower lobe atelectasis .