Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lungs are well expanded . There is minimal retrocardiac subsegmental atelectasis , confirmed in the lateral view , but no focal opacities concerning for pneumonia . Cardiomediastinal and hilar contours are unremarkable . There is no pleural effusion or pneumothorax .
    OUTPUT:
    
Unremarkable chest radiographic examination .