Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There are relatively low lung volumes . Mild bibasilar opacities may be due to atelectasis although underlying infection is not excluded in the appropriate clinical setting . No pleural effusion or pneumothorax is seen . The cardiac and mediastinal silhouettes are unremarkable .
    OUTPUT:
    
Low lung volumes . Likely bibasilar atelectasis however , infection not excluded in the appropriate clinical setting .