Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is low lung volumes bilaterally with areas of linear opacification inferiorly , most likely representing bibasilar atelectasis ; however , in the appropriate clinical setting , there could be superimposed aspiration . Otherwise , there are no other areas of focal consolidation . There is no pleural effusion or pneumothorax . The cardiomediastinal silhouette is unchanged and within normal limits . The pleural surfaces are unremarkable .
    OUTPUT:
    
Bibasilar atelectasis . In the appropriate clinical setting , aspiration can not be ruled out .