Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Portable upright chest radiograph ___ at 15 : 17 is submitted .
    OUTPUT:
    
There is improving aeration in both lungs suggestive of resolving pulmonary edema . Residual patchy opacity is seen at both bases which may reflect atelectasis or subsegmental atelectasis , less likely pneumonia . Overall cardiac and mediastinal contours are stable given differences in patient rotation . No pneumothorax .