Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lung volumes are low . Cardiac silhouette size is not enlarged . The aorta is mildly tortuous . Crowding of the bronchovascular structures is present without overt pulmonary edema . Linear opacities in the lung bases , more so on the left , are compatible with areas of subsegmental atelectasis . No large pleural effusion or pneumothorax is seen . No areas of focal consolidation or demonstrated . No acute osseous abnormality is detected . Extensive degenerative changes are seen involving the left glenohumeral joint .
    OUTPUT:
    
Low lung volumes with bibasilar atelectasis .