Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Portable upright chest radiograph ___ at 04 :21 is submitted .
    OUTPUT:
    
There is improving aeration throughout the lungs with resolving pulmonary edema , although there still is some residual mild interstitial edema . There is also improved aeration in the retrocardiac region consistent with resolving partial lower lobe atelectasis . There is likely a layering left effusion . No pneumothorax is seen . Overall cardiac and mediastinal contours are stable . Right subclavian PICC line and endotracheal tube are unchanged in position . A nasogastric tube is seen coursing below the diaphragm with the tip not identified .