Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The study is limited due to rotation and low lung volumes . The heart is moderate to severely enlarged . Widening of the superior mediastinal contour is seen similar compared to the prior study and attributable to mediastinal fat as seen on the prior chest CTA from ___ . There is crowding of the bronchovascular structures , and mild pulmonary edema is likely present . Bibasilar airspace opacities could reflect atelectasis . Infection can not be excluded . There is no pleural effusion or pneumothorax . Degenerative changes of both glenohumeral and acromioclavicular joints are noted .
    OUTPUT:
    
Limited study due to patient rotation and low lung volumes . Mild pulmonary edema and bibasilar atelectasis . Infection in the lung bases however can not be completely excluded .