Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Portable AP upright chest radiograph ___ at 15 :38 is submitted .
    OUTPUT:
    
Bibasilar opacities could reflect atelectasis , pneumonia , or aspiration . Clinical correlation is recommended . No pulmonary edema . Heart is upper limits of normal in size . Mediastinal contours are within normal limits . No pneumothorax . No large effusions .