Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Cardiac silhouette size is normal . Mediastinal and hilar contours are unchanged . Pulmonary vasculature is not engorged . Lungs are clear . No pleural effusion or pneumothorax is present . Bilateral shoulder arthroplasties are incompletely imaged .
    OUTPUT:
    
No acute cardiopulmonary abnormality .