Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The heart size is normal . The hilum and mediastinal contours are unremarkable . The lungs appear well expanded and clear . There is no evidence of pleural effusions on the frontal radiograph or pneumothorax . The visualized osseous structures are unremarkable .
    OUTPUT:
    
No acute abnormalities identified . Specifically , no evidence of pleural effusion on the single frontal radiograph .