Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lungs are well expanded . An ill - defined band of opacity along the right lung base without correlate in the lateral veiw may represent atelectasis versus summation of tissues . Otherwise , no other focal opacities are seen . Cardiomediastinal and hilar contours are unremarkable . There is no pleural effusion or pneumothorax .
    OUTPUT:
    
Ill defined opacity in the right base is more likely atelectasis or summation of tissue . Otherwise , unremarkable chest radiographic examination .