Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Portable upright chest radiograph ___ at 15 :22 is submitted .
    OUTPUT:
    
Overall cardiac and mediastinal contours are within normal limits . Lungs appear well inflated . Faint opacity at the left base may reflect patchy atelectasis , although aspiration or early pneumonia should also be considered . Followup imaging may be helpful . No pulmonary edema . No pneumothorax . No acute bony abnormality .