Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lung volumes are low with patchy bibasilar opacities , overall improved from same - day radiograph . Cardiomediastinal silhouette is unchanged . There is no pleural effusion or pneumothorax . Transvenous pacing leads again seen with the right ventricular lead not seen on this radiograph . No acute osseous abnormality is seen .
    OUTPUT:
    
Low lung volumes with patchy bibasilar opacities ; given relative improvement from same - day radiograph , findings likely represent atelectasis or uncomplicated aspiration .