Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The cardiac , mediastinal and hilar contours appear stable . There is no pleural effusion or pneumothorax . Minor opacification of the right lung base is probably due to atelectasis . Lung volumes are low .
    OUTPUT:
    
Patchy right base opacity , probably atelectasis although pneumonia is hard to entirely exclude . Radiographs could be repeated if there is persistent clinical concern for the possibility of developing pneumonia .