Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lung volumes appear low considerably more than on the prior film . I suspect this is accentuated by kyphosis . There is also slight rotation . Allowing for differences in positioning , the cardiomediastinal silhouette is similar to the prior film . There is upper zone redistribution , without overt CHF . There is bibasilar patchy opacity more pronounced than on the prior film , most suggestive of atelectasis . No gross effusion is identified . No pneumothorax detected .
    OUTPUT:
    
1 . Low inspiratory volumes , more so than on the prior film question accentuated by kyphosis and positioning . 2 . Mild patchy opacity both lung bases , most suggestive of atelectasis . In appropriate clinical setting , an early pneumonic infiltrate would have a similar appearance . 3 . Upper zone redistribution , without overt CHF , without significant change . 4 . No pneumothorax or gross effusion detected .