Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lung volumes are slightly lower since ___ . New linear bibasilar opacities are most suggestive of atelectasis . No acute osseous abnormality . The cardiomediastinal silhouette and hila are unremarkable .
    OUTPUT:
    
Linear bibasilar atelectasis . No definite pneumonia , but short - term followup radiographs may be helpful if clinical suspicion for infection persists .