Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Small residual right pleural effusion has improved since the pre drainage film . The right pigtail catheter has been removed in the interim . A linear opacity in the right lower lobe is consistent with atelectasis . The cardiomediastinal silhouette is normal . Hiatal hernia is unchanged . Spinal hardware and the CBD stent in the right upper abdomen are in unchanged position .
    OUTPUT:
    
Small residual right pleural effusion has improved from pre drainage films .