Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: A tracheostomy tube is unchanged in position . The lung volumes remain low . Mild pulmonary edema has improved from ___ . Opacification at the right lung base is unchanged , most likely atelectasis . A small - to - moderate right pleural effusion and small layering left pleural effusion are similar to the prior exam . No appreciable pneumothorax is seen on this supine view . Moderate enlargement of the cardiomediastinal silhouette is unchanged .
    OUTPUT:
    
1 . Improved mild pulmonary edema from ___ . 2 . Unchanged small - to - moderate right pleural effusion and small left pleural effusion . 3 . Right basilar opacity reflecting atelectasis .