Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There are low lung volumes with bibasilar atelectasis , obscuring assessment of the heart and mediastinal structures . An ovoid structure in the upper portion of the right mediastinum likely represents a vascular structure . Additionally , the remaining visualized portion of the lungs demonstrates crowding of the bronchovascular structures and interstitial prominence , likely reflecting some degree of pulmonary edema . Lateral view demonstrates no appreciable pleural effusion . Patchy opacities in the lung bases are noted , likely atelectasis though infection can not be excluded . No pneumothorax seen in this upright radiograph . Severe degenerative changes are present at the right glenohumeral and acromioclavicular joints with a probable chronic rotator cuff injury .
    OUTPUT:
    
Low lung volumes with mild pulmonary edema and bibasilar atelectasis - underlying pneumonia can not be excluded .