Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lung volumes are lower in comparison to the prior radiograph . There is a small region of linear atelectasis at the right base . There is no consolidation , edema , pleural effusion , or pneumothorax . The cardiomediastinal silhouette is normal . An IVC filter is seen in the mid abdomen and unchanged in position from the prior study .
    OUTPUT:
    
Right basilar linear atelectasis . No evidence of pneumonia .