Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The cardiac silhouette size is mildly enlarged . Thoracic aorta is diffusely calcified . There are likely small bilateral pleural effusions with streaky opacities in the lung bases likely reflective of atelectasis . Elevation of the left hemidiaphragm is chronic . No overt pulmonary edema is present although crowding of the bronchovascular structures is noted due to low lung volumes . There is no pneumothorax . Degenerative changes are noted in both acromioclavicular joints .
    OUTPUT:
    
Probable small bilateral pleural effusions and bibasilar atelectasis in the setting of low lung volumes .