Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Slightly rotated positioning . The ostomy tube noted . An NG tube is present , tip extending beneath diaphragm off film . Left subclavian PICC line tip overlies mid SVC . No obvious pneumothorax identified . Inspiratory volumes are slightly lower . Cardiomediastinal silhouette is grossly unchanged . There is upper zone redistribution and mild vascular blurring , suggesting mild CHF . Minimal bibasilar atelectasis . No gross effusion .
    OUTPUT:
    
Lower inspiratory volumes . Possible mild vascular plethora . Bibasilar atelectasis . Mild increased retrocardiac opacity , similar or slightly improved compared with the prior film . No gross effusion .