Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Left flexible chest tube remains in the left hemi-thorax . Moderate left pleural effusion appears slightly decreased . Cardiomediastinal silhouette is shifted to the left , but is unchanged . Right basilar atelectasis is mostly unchanged . No pneumothorax is seen .
    OUTPUT:
    
Small decrease in moderate - sized left pleural effusion . No pneumothorax .