Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Portable AP upright chest film ___ at 12 :00 is submitted .
    OUTPUT:
    
Cardiac and mediastinal contours are within normal limits . Lungs appear well inflated without evidence of focal airspace consolidation to suggest pneumonia . Linear opacity at the left costophrenic angle either reflects subsegmental atelectasis or scarring . No large effusions . No pneumothorax . No pulmonary edema .