Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There may be subtle increase in opacity at the right lung base which could be due to atelectasis although underlying aspiration or pneumonia is not excluded . No pleural effusion or pneumothorax is seen . The cardiac and mediastinal silhouettes are unremarkable .
    OUTPUT:
    
Possible subtle increase in opacity at the right lung bases could be due to atelectasis but subtle aspiration or pneumonia is not excluded in the appropriate clinical setting .