Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Portable AP upright chest film ___ at 12 : 20 is submitted .
    OUTPUT:
    
The lungs remain well inflated without evidence of focal airspace consolidation , pleural effusions , pulmonary edema or pneumothorax . A chronically dislocated left shoulder is again visualized . Overall cardiac and mediastinal contours are stable .