Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Bibasilar opacities may be due to atelectasis however , underlying infectious process due to aspiration is not excluded in the appropriate clinical setting . There is no pleural effusion or pneumothorax . There are relatively low lung volumes . The cardiac and mediastinal silhouettes are unremarkable .
    OUTPUT:
    
Bibasilar opacities most likely due to atelectasis however , developing infectious process is not excluded in the appropriate clinical setting .