Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Compared to the prior study , there is slightly more pronounced upper zone redistribution . In addition , there is new hazy opacity at the right lung base . This likely represents an element of atelectasis . The possibility of an element pleural fluid can not be excluded . The right hemidiaphragm is partially obscured . Aside from some subsegmental atelectasis , the left base and remainder of the left lung remains grossly clear . The cardiomediastinal silhouette is grossly unchanged . Background osteopenia and degenerative changes of the spine are noted . There is left - sided wedging of a lower thoracic vertebral body , question T11 or T10 , which is similar the T - spine CT from ___ ( at which time it was designated T10 ) .
    OUTPUT:
    
Opacity right base completely new compared with ___ and increased compared with ___ . If clinically indicated , a lateral view may help to better characterize this finding . .